Thanks for posting your querry.
As you have mentioned that you had back pain
for several days, i am assuming that you have been taking pain killers for the same. Painkillers if taken in large quantity cause the symptoms you have just described ie: pain in center radiating to sides in abdomen specially under breasts. This seems like severe case of gastritis
/ ulcers to me which needs to b treated with antacids. You must have cold
milk and milk ice creams like vanilla to sooth your cramps and pain. Do NOT take any more pain killers. Also avoid spicy and oily food.
I would strongly recommend you to visit your physician for prescription for medicines.
Wish you a speedy recovery.