Upset Stomach

I have had an upset stomach since last night, which started before I went to sleep. I tried to recall the last food that I ate and it was a cantaloupe melon. I didn't think that melon would cause the pain. I am a little bit confused about what might be the reason behind my upset stomach. I ate dinner around 7:00 pm. I had baked chicken, rice, and rice cake or biko. Then after that I watched a movie and updated my blogs. But before I went to sleep I ate the melon around midnight. Well, I don't really know. But maybe I need an alka seltzer fizz. They say that helps, and I never tried it. It looks like fun.