You need to see a doctor bro, sounds serious.

Why do you have all these pains suddenly? Could you explain more? Is it due to your martial art classes? or do you do many sit ups? or you were whacked in the back during sparring? When you say you arch your back, is it forward or backward arch and why do you have to arch your back?

forward, i dont know, i just do alot of chin ups. My shin,knees and all feel like no power. When i run like 5 rounds my ankle and knees will start to have pains, and my shin too.

I had nearly the same think after a hard sparring session. I tried physio, but no luck, then i tried this chiro, and it really helped. I only had to go a few times. You can give it a try. It's worth a shot. You can google it Paramount Chiropractic.