ESA-too distressed to attend assessment

Do I send all my evidence to the dwp, the assessment center, or both?

thanks, just heard that all face to faces are temporarily suspended. I will still send the letters as they contain relevant medical information which will hopefully help them come to the right decision.

I have now received another letter saying I have to attend the interview and they will be sending me an appointment shortly. What can I do? I've written again to my mp and I'll try to get another doctor's letter. Also the letter now says universal credit not esa, and I thought I could not be moved to UC as I have a severe disability premium. I'm still waiting on my inheritance which would make all this unneccesary anyway, but meanwhile I'm panicking.

PS apart from everything else, even if I did feel able to attend I had severe double broncho pnuemonia when I was 20 resulting in lung damage so I have to be careful anyway.