SEAFOOD INJESTION REACTION

SEAFOOD INJESTION REACTION
I am generally a healthy person who has suddenly (in the last 6 months) started to react to ingesting seafood. I am not certain of the specific seafood that maybe the cause of this reaction except I seem to have it narrowed down to one of three possibilities.
1. Oysters, although not suspected to be the main cause, every recent reaction has included these, fresh (on the rocks) each time and not subject to bad handling
2. Fresh prawns, although on two occasions these have been cooked in a fish stew or curried in a potato base mix
3. Fresh salmon, not always included in the reactive mixes, this could be discarded
4. Fish, freshly cooked and has been of a variety of smoked salmon, cod and Australian barramundie
The reactions I am getting from the ingestion of one or more of the above is anything from a sudden and violent stomach reaction which results in a thorough discharge of the contents through vomiting repeatedly until the entire contents is removed. Some occasions, the reaction has been almost instantaneous while on other occasions it may be two to three hours after ingestion.
Recovery is usually within minutes after the body has overcome the urge to vomit although yesterday I did continue for some hours with cold flushes.