I feel like i have bed sores! I have gained a lot of weight not doing anything since Dec 22, so at least i'm lifting that

Seriously, i am not enjoying not doing anything, but am hopeful it wont be forever. I can no longer walk to work even, I tried a few times and was debilitated for a few days afterwards...I am only taking short walks daily. I just went back to one job this Sat after 3 months off as it involves some lifting (ie taking dishes out of a sterilizer and putting new loads in). After doing that a few times and kicking a soccer ball with a kid (not running and playing hard at all) I started getting symptoms, and still have them, very mildly, 2 days later.

I really appreciated all the notes about taking it slow - it is 100% true. I am wondering if there is anything i can do - like some yoga stretches? I know it's personal limitations as each PCS is unique, but does anyone have any exercise they are able to do?