What should i do now ?

Good morning,

Update on my condition: I thought I had ME/CFS and I think I did. I haven't done any intensive exercise for a week and I feel better, less standing tachycardia, pressure in the head, I'm finally sleeping well, at least better... and I can work (I'm a book editor and I have a very, very cognitively demanding job) at almost 100% all day. I can also pick up the kids from school and run a couple of errands. But I'm taking it slowly... In the evening I collapse at 10:30 a.m. and wake up at 4 a.m. then go back to sleep after an hour of insomnia until 6:30 a.m.

What should I do now? Forget sport? I have not yet attempted any sustained effort (gardening, walking for 30 minutes without stopping...), am I still waiting? I also have dysautonomia, but it calms down when I'm not crashing.