Is it safe to eat lunch when your stomach hurts?

I'm at school right now (I logged on to YA in the library) and my stomach is bothering me, probably because I ate too much last night. I had food from taco bell (three tacos, a bean burrito, and an empanada), and later on I stupidly ate some Lays chips with dip and some ice cream. After I pigged out my stomach really hurt. I went to the bathroom later (#2) but my stomach feel felt the same. When I layed down in bed it still hurt but I was able to relax and got some sleep (about 5 hours). I feel a little better today, but I didn't eat breakfast. I had PE first period, and my stomach hurt a little bit when I ran. Now I'm sitting in the library with a stomach that feels a little better, and I have lunch in about an hour. I do feel a little hungry, but I'm scared if I eat I might hurt my stomach more. Is it safe for me to eat? I feel a bit better but I still feel a little queasy... It still hurts a little bit...