Medical friday making me ill

Hi i am new on here and dont know what to do. I have a medical assessment on friday and i just can not go. All this is making me so poorly i can not begin to explain. I suffer from anxiety, adhd, chronic co morbid depression, fibromyalgia, arthritis and spinal stenosis.
The thought of having to be questioned and examined by a stranger who i know their sole purpose is to find anything that will disallow my claim makes me physically sick.
Since i opened the letter i have been shaking and crying and then getting angry and lashing out at everyone. I am a complete mess. I havent been like this in years. The only way i could possibly attend this assessment is if my doctor gave me a very strong sedative drug to make me numb. However if i was sedated i could not answer any questions at all. I wanted a home visit but dont know i have a good enough reason to be allowed one.
They will think because i manage to go to my gp and psychologist and therapist that i can go there. But they dont understand that i am fine going there because it is my choice and i know these people are trying to help me which is why i go and no one is forcing me. But with this it is a completely different scenario they are forcing me to see a stranger who is going to interogate me and test me and try and trip me up so that my benefit will be stopped.
I just cant go through with it and dont know what to do. Please help thank you.

Thank you Gordon that has really helped me a lot. I am seeing my gp tomorrow and hopefully she can help. I did warn her this was going to happen but she told me not to worry as they would write to her first and she would send them a letter and i would not have to attend the assessment. I believed what she said but now ut seems she really doesnt have a clue what she is talking about. Now the worst has happened and the assessment is friday and the only appointment i could get with my her was tommorrow which is the day before. So i dont know what my gp could do so near to the time. I am also unaware of what powers my gp actually has with persuading these people i need a home visit or paper interview. Can you advise what i should expect from my gp and if she can do anything at such short notice. My appointment with her us at 9am in the morning. Thank you

We had this with our son. His GP was insistent that they would write and ask if he put it in his application.

The biggest part of the joke is that my sons request was written on his notes and the notes went with the application. Of course no home assessment was provided.
We then contacted the GP and he did a letter very fast which we collected and then sent recorded delivery to Atos. We had called Atos and informed them about the letter. The new appointment for a home assessment came through 2 days later upon them receiving the GP letter.

This was, however, 4 working days prior to the schedules F2F at a centre. GPs seem to be playing hard ball with the DWP regardless of the effect on their patients. They all know they will not get a request from Atos/DWP for a letter or even for patient records.

Good luck, you can do it

Thank you Gordon i am on way to gp now i can not tell you how much your support has meant to me. Just having someone who knows the procedure has helped with my worries thank you. I will let you know the outcome. Tracie