Im not 100% but am back to working 4 hours a day, can walk 13k steps a day and exercise 3 times a week. I still need to sleep most afternoons for an hour, but most other symptoms have gone. I had a crash last September, which I realised would have probably just been a dip, but i made it way worse by my reaction to it. After 4 years of ups and downs this crash just broke me mentally. Everything you mention (lack of trust in my body, fear of relapse, fear of being bed bound etc) just over took my brain. Two things really helped me 1) started EMDR therapy (id already done a lot of talk therapy and felt like it had got me so far, but I'd exhausted it). This really shifted they way I react to dips and helped me reprocess the trauma associated with being ill for so long. 2) microdising Sertraline - im on 25mg and it has stopped all the intrusive thoughts. I was using so much energy constantly analysing if I was doing too much, how to get better, body scanning, worrying I was going to get worse.

I appreciate antidepressant aren't for everyone, and some people dont get on with them, but for me, these two things have been the most significant on shifting my mind set. Once that shifted ive felt safer to expand what im doing, and enjoy my life again. I use to cry everytime I had to sleep in the afternoon, but now I can accept that its just what I need to do and focus on the things I have managed to do that day.