New user/Change of circumstances

Hi All,
I have just joined this site.
I was awarded PIP at the basic rate about 2 years ago. I haven't worked for over a decade because of my disabilities. (There's a backstory here but irrelevant to the current issues I'm facing.)

I am a 66 year old woman with high functioning autism (what would have been called Aspergers), extensive osteoarthritis, fibromyalgia and heart disease. I also suffer from treatment resistant depression and anxiety, and complex PTSD which has been re-triggered by all this crisis and upheaval.

When I was awarded PIP I was in a share house situation with a friend who helped with transport, household chores and looking after my dog. It wasn't a perfect situation but it felt stable and I felt supported. I had use of the car when I needed it.

In Jan this year we received a no fault eviction notice which resulted in me having to move 250 miles away as I was offered a housing association home where I was allowed to keep my dog. There were no other choices available so I took the leap into the unknown.

So I now live alone and don't know anyone in the area. I have no support network, and very few friends anyway due to my 'challenging' and 'complicated' personality, (or so I have been informed.)
I am rather reclusive by nature because of all my health problems as it all tends to dominate my world but is tiresome and boring for other people. I guess I'm not much fun.

Anyway, here I am 2 months later with a whole new set of challenges and difficulties.

I joined this site to try and work out how best to approach DWP but I am absolutely overwhelmed with information here.

Can someone please help direct me to the best information to start working out what to do?
Should I begin with informing DWP or should I have a battle plan in place? Is there advocacy available?

( I have an appointment next week with a mental health support worker from my new GP surgery and hopeful that my new GP is going to be more helpful and supportive than my last one). It seems that adult autism support is more about socialising and outings than practical help.

My main (but not only)concern is transport and mobility but I am confused about the rules because of my age (now retirement age for me) and how this affects everything, plus looming changes to the rules as my highest score was a 3 on the original assessment.

Do I need to start the ball rolling on Monday morning regardless?

Apologies if this has already been covered elsewhere but like I said, I'm completely overwhelmed on this site.
And now panicking and feeling like its all too hard and whats the point anyway, its all just going to escalate the stress and anxiety.

Many Thanks in advance if anyone's able to offer any help.

Thank you - that clarifies the situation.
I was 66 in March which is retirement age for me, born in 1959.
I really need a vehicle but its way too late for me to appeal and there's no hope of qualifying for Motability now even if I did risk pushing for a new assessment.
I wish I had known all this at the time I was first awarded PIP as after watching the webinar I know now that the crucial points as to whether I can complete a journey safely (no) repeatedly (no) and in reasonable time (no) would have made a big difference.
They didn't ask me any of those things at the assessment and were focused on the fact that I CAN walk more than 50 meters with the aid of hiking poles and opiate pain relief, and as long as I was walking between seating or benches where I could stop and rest.
I am prone to falls when walking, (knees and hips sometimes give way ) and I fell heavily 3 weeks ago, injuring my back and right shoulder.
My neighbour had just taken delivery of a brand new Motability EV SUV and he asked me why I didn't have a Motability vehicle, given my situation.
Thats what started me wondering whether I should think about requesting reassessment and led me to this website.
Although in severe and constant pain I do force myself to walk every day as I have a dog (I used to have help with dog walking on the days I couldn't manage, but not since moving house. He's not the type of dog that just anyone can take around the block and needs an experienced handler, and wouldn't go out with a stranger anyway without me being there.)
Getting out and walking the dog helps with my state of mind and physical health and on balance its a net benefit even though it exhausts me and my whole life revolves around walking the dog every day.
After the most recent fall I did think I may have to consider re-homing him but couldn't bear to do that.
He's everything to me and my reason to get up every day.
Although not officially an assistance dog he is my support dog and I don't feel safe without him. We did 12 months specialised training when I first got him 8 years ago , specifically to help me overcome PTSD.
I really struggle with public transport and I'm prone to severe panic attacks if I'm alone in a taxi with a male driver.
I can't follow directions even using google maps even with voice directions on and get confused, but that wasn't raised at the assessment and I didn't know to make a point of it.
Since moving house I now rely on grocery deliveries and microwave ready meals, and without strong pain killers and the dog to help me feel safe I wouldn't be unable to leave the house half the time.
So I never go further than walking distance, which isn't far.
Even going to doctors appointments is difficult and stressful as I can't take Jake with me.
So I guess I'm going to have to somehow try and save up to buy a cheap car as without it I will be housebound in winter.
I live at the top of a very steep hill in an area that has bad winters. I can barely make it home on a good day, let alone with snow and ice.
Anyway, now I know where I stand.
It makes me angry and upset that I have been put in this situation but there's nothing I can do now. At least I'm not homeless which was a real possibility.
I have to just hope and pray that the PIP changes they bring in don't result in me losing the basic living allowance. I suppose I was lucky to even get that.
Thanks for your help.
J