Stomach and back pain when breathing.

Patient: 7 days ago I started feeling this sharp pain under my left breast that felt like it went all the way to my back. I figured it was just a pulled muscle. But it started to spread. Last night I had a friend pop my back… I thought it would help. I think he pushed a little too hard because I woke up and now it hurts when I take a deep breath, sit up, turn my body or touch my toes. It hurts in my stomach and my back.What could be wrong here?