Sometimes too much coffee can help create stomach ulcers. I had one when I ate some things too much. Very very painful and I couldn't sleep. A doctor gave me some medicine for that. An ulcer is a very common thing to happen. Stress, no sleep, coffee are some causes of ulcers. Spicy food is another cause sometimes when you add coffee and no sleep.

Ask about ulcers. He will be able to tell. Almost always easy to treat.