I'm 39 and up until 5 years ago i could eat shrimp, lobster, scallops, mussles and what not. Then i suffered some bouts of stomach cramps, varying between unfomfortable to downright excruciating. Before long i discovered that the one thing that these episodes had in common was the consumption of shellfish/mollusks beforehand. Usually in company where no-one else had issues.
I'm pretty sure it's not an alllergy, as i suffer no symptoms besides the cramps and feeling somewhat queesy.
I also do not get ill when the shellfish is part of a sauce or condiment like oystersauce or Nuoc cham.
Does this sound familiar to anyone and have you been able to mitigate this issue besides steering clear of consumption?
The reason i ask is because i'm going to Vietnam for a month and not being able to eat seafood is going to severly limit my dietary options.