PIP medical on Tuesday

Can anybody advise me? Im so anxious about my assessment I have Physical and mental health issues...Fibromyalgia. Complex PTSD and neurological problems as I have pernicious anaemia. I have recently started using a mobility scooter as the pain I experience when attempting to walk sparks off panic attacks and my energy levels crash so bad I am unable to function. I have no support system whatsoever due to my issues. I was awarded low rate PIP two and half years ago. I always thought this was wrong due to my difficulties. I have absolutely nobody who i can ask to go with me to the medical and now I am thinking this is going to go against me. I am desperate for support however social services only deemed that i needed 4 hours a week support wwhich would work out that i would be able to " buy more hours from eleswhere than the cost social services charge . This i did. however due to the expense of buying a scooter and other disability costs i have to manage without as my priorities meant the scooter came first . please advise regarding going alone