Im experiencing the same burning muscle pain in my legs, just walking to the fridge hurts. After being in ICU with covid i had a few months on physical therapy (pool therapy) . Nothing worked sadly. And like everyone on here my doctors just dont know. I was hoping someone might have an answer but it helps to know I'm not the only one (not that im happy others are suffering) it just helps to show my doctors there are so many out there and im not exaggerating this pain and please do more to try to get me some answers if possible!