I think I need to go to the GP but am not sure how to describe this, I will try on here first...
It's a stomach ache that comes on quickly after I eat. I have had it for years but am getting it more and more often recently. For instance I know eating mussels brings it on, so I don't eat them. But the other night I had it after eating salmon and broccoli, and tonight after finishing off DD's pasta and broccoli 
It's not like IBS (which I used to get in my 20s, before I stopped smoking), not crampy and the pain is higher up my abdomen - more like a band of intense discomfort, sometimes it eases after an hour, sometimes it goes on all night. It also makes me feel shivery and sick (although I never actually vomit). It's horrible, all I want to do is lie on my stomach and try and sleep till it passes off - not always possible with small children!
I think it might be a food intolerance - but to what?? Or could it be an ulcer (although I don't get heartburn)?
Anyone had similar?