I'm on a similar boat with general malaise, breathing issues, and insomnia. Has been going on for about 2 years and has destroyed my quality of life and ability to do any kind of physical activity. Doctors have no idea and have essentially just told me to live with it.

It seems like being caught in limbo - being just well enough to work and subsist but too ill to go out and really do things. I just keep hoping one day it will just got away.