Suggest Remedies For Muscle Spasms Below Rib Cage

i recently started having (i believe muscle spasm) on my right side just below the right rib cage. Can you recommend any medication or exercise to do to prevent such pain from happening.

It feels like a knot in the muscles and it moves around in that area, it is very painful and it hurts alot.i dont want to experience this pain any more, i cried each time it happens. Please shed some advice.

Thanks..Simmy