Hey Jamie,
I used to have bad panic attacks too. They drained me out loads. It could be fibromyalgia but I still think with extreme stress you've been through that it could be severe exhaustion. My panic attacks made me feel weak and fatigued a lot. I think you've done well so far. The cold shower/hot bath thing is a starting point to try and cope with pain and fatigue. Try meditation when you have a spare moment too. Just know that I strongly understand your situation. It could also be a part of your bipolar or your medication doing this. Once you have both under control then you'll feel better in yourself and the OCD thing, I think it's good because you keep yourself busy in terms of the panic attacks but try and lesson the time length you spend cleaning; do it gradually because this could be along side with not sleeping the reason why you are fatigued all the time. Mental and physical exhaustion combined can be brutal. I've had it before. It's horrid but you soon see the light. You've just got to find the right meds, the right coping stratigies and the right pace to stabilise yourself
Just know I'm here for you, ok? Keep being strong and brave.
many hugs, arielle.