Why does my stomach hurt if I eat "food" for breakfast. I can drink coffee with no problem, but start feeling sick if I eat food.

Medicine or pregnanc. The first question for a woman your age is "could you be pregnant?" if you are not sure, buy a pregnancy test at a drugstore and find out. The second question is "could it be a side-effect of one of the medicines/" stop both the Ibuprofen and the gabapentin. Either of these drugs could cause the jpain of which you are complaining.