Yes, ME for over 35 years now. I don't have any mental health problems like depression or anything, just plain old ME.
I have tried therapy, gradually increasing exercise and activity but that hasn't improved it. There have been a couple of times when I really thought it was all over and done with, only for someone to come home with a virus and have the whole thing re-triggered!
I have been very, very fortunate in that I was often in the 0-30% well range, housebound and often bedbound but now stay mainly in the 30-70% well range which is fantastic
Things that improved it for me: rest: more than you think you need, really clean diet, so organic straight from the tree, ground or animal type of eating, eat as little processed food as possible. (that would include even simple things like jam, condiments etc). If you do get good days, some kind of movement/exercise but rest like hell for several days afterwards!