Autoimmune diseases & weight management

I've been off and on MFP for about 15 years. My struggle with losing/maintaining weight has varied over the years. For the past couple of years I've been dealing with 2 autoimmune diseases. I also have food allergies. This makes diet and exercise a challenge. I deal with horrible insomnia (and yes, I've tried everything) so I only get in about 2 workouts a week due to exhaustion. I also have to be very careful with my protein intake.. so, I find myself losing muscle. It's extremely frustrating, to say the least. Anyone else going through some major health challenges? And, how the heck do you deal with it? My mind tells me to workout but I have to listen to my body. I would love to hear if any of you have something similar going on.