Weird stomach ache

I woke up this morning super, super hungry. I ate a couple bites of yoghurt (shared with LO) and a serving of cereal with almond milk. I was still hungry so I started drinking ice water while I started doing laundry, dishes, dinner prep, etc. and now I have a stomach ache like I overate.   I have never had this happen before. Did I drink too much water? Too fast? Too cold? What gives?