Hey Lulu!
I had this the past two nights. Thought there was something really wrong with me, but turns out that I was just about to get my period (3 days early! ah!). Anyway, a couple of thoughts...have you been constipated at all? Somtimes when you are constipated for a while, you'll get something called bypass d* where some bowel movements just go around the block part and it's usually d* (but you don't feel sick at all). It could also just be something you aren't digesting properly. Let me assure you that this does not sound like an SV or noro at all. The best thing would be to eat something bland like toast, crackers, or some rice (my favorite). It will help your hunger and it won't be too hard on the stomach. I'm sure you're fine!

Hang in there!