I've Been Having These Stomach Problems For The Past Couple

I've been having these stomach problems for the past couple days. I would wake up and do my normal morning routine. After breakfast, I my stomach would gurgle and I feel nauseous. I don't think it's milk because I didn't drink any milk this morning. It was bad enough that i had to miss school both Tuesday and Wednesday. Today was a little better, but not much. The weird thing about this is that I would feel better around noon. Can someone explain what is happening and how I can get rid of it?