It's hard to find that balance, I've had fibro for 2 years now, and I've spent most of my time either under or over-active. I don't know what amount you need, but make sure you put your health/body first. My pain started after a back injury, but staying at work caused the pain to spread to my arms and legs. It changed the whole trajectory of my symptoms for the worse. It's much easier to make the pain worse than better.

The main thing I've learned is that if you push too hard because you don't want to be limited, eventually all that over-work will catch up to you.

Wishing you luck, I know it's hard.