I feel for you. I know just what you are feeling cause I was there. I am just starting to ride after 107 days.
Take heart, it's not as bad as I thought it would be, but it's just something a person has to go through I guess.
Mine started out like the flu, then to sinus headaches in the extreme. Had sinus surgery, which I needed badly.
The extreme fatigue continued and the original problem finally turned out to be a thyroid problem.
There for a while I thought
I would never ride again. Good luck, and try to stay up, I know, its hard, but things will get better.