Being in bed all day with PCS is a tough situation. But you have to slowly start moving around and some medicines may help. At least for me it worked since I was in that situation where every movement made my condition worse.

I even feel that way severely at times but it passes. I still have symptoms at some level everyday.

One thing helps me during initial stages a lot is Xanax. I don't advice on Benzos but it can help your brain to stay calm and you can start moving around and before you get used you can quit and take only on a needed basis.

Just a thought.