I did a backbend and my stomach popped multiple time. It hurt but it's feeling a bit better. How can I make it stop hurting?

Warm compress where it hurts, rest for about a day.

Explanation:

Just like period cramps, its a muscle issue. (most likely.) It will help to heal the muscle that you most likely pulled.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.

so what is your question?