@Gingergrrl I don't use a wheelchair and I don't have breathing problems either. I had breathing problems in the beginning. I had lung capacity test, tests for viruses in the throat and nothing showed abnormal.
My "showing" problems are:
heart rthym problem, that I use betablockers daily
Hashimoto's tyroid diagnosed but nothing done about it
vitamin B deficiency I take injections 3 monthly and I don't think this amount is sufficient for me
very stiff neck I was told due to herniated discs on my neck prescribed pain killers but not take them as they ruin my digestion
and lastly I have Lichen Sclerosis that nothing yet helped
My other problems have not been diagnosed are, sporadic extreme fatigue and brain fog. Frequent digestive issues and constant vertigo in various intensity.
My symptoms are different than yours. I practice very mild yoga, I can use my legs to a highish degree. They feel usually little heavy and limp at times, not much muscle tone nowadays. But I am very sure not being able to lift my legs is not due to my muscles. I can't lift is not enough description. When I tried, I didn't even struggled. I feel the command did not even reach to my brain, let alone to my legs. There's a communication problem in my body.