The first thing I think of is gall stones? I've never experienced them, but friends that have talked about their reaction to greasy and fried foods. Since it's only been going on for a few days, pay attention to when you get sick. Keep a food journal, if necessary. If the problem continues, see your doctor and take the journal. Hoe you feel better, Mum.
Sounds like acid reflux and you should try an over the counter acid reliever. If symptoms persist I would strongly suggest seeking professional help. It may also just be a plain old stomach virus.