Thanks for you posting here and talking about your concerns. I'm glad that you trust us to put your heart out as I do, I'm new here so I'm in the process of getting familiar with it here.
I'm listening although I'm not a medical expert. I'm sorry to hear that and I understand how mental health issues can go along with physical health issues which definitely do not make life easier.
I also experienced chronic fatigue and allergic reactions etc because of my own mental health problems. As I do believe drinking too much tea and coffee are bad, I do drink just to keep awake as I have to do my works and as someone who doesn't exercise much but I find just walking in the parks (faster than usual) is surprisingly refreshing and make me feel (at least) a bit energetic. I usually don't have a plan and just go random routes.