Pork allergy?

I've noticed that whenever I eat pork, my body goes through a very predictable and quite unpleasant (but not life threatening) reaction:

- Within 5 or so minutes, my body becomes extremely warm.
- Within 15 minutes my skin starts itching and my stomach becomes incredibly bloated.
- Within 30 minutes to an hour my blood pressure starts dropping, and I start to feel extremely drowsy (approximately as one would feel after 2 liters of beer). I am unable to perform any mental tasks, feel extremely thirsty, and usually need to lay down for at least an hour to return back to normal.

After that, the itching and bloating continue to the point where unless I consume alot of water, go to the bathroom, drink some coffee, take a walk or nap, I become completely incapacitated to think, talk, or walk.

I have read that many meat allergies are actually triggered by food additives such as meat tenderizers, msg, etc. I know that in the are where we live, all food is drenched in MSG and most meat is cooked on propane ovens. Sometimes I can even taste the propane in the food. I wonder if this contributes to the reaction. (I get a similar reaction to red meat cooked locally, just not to the same degree ).

I have heard mixed reviews of the blood type diet, but one of the things it mentions is that pork is not recommended for any blood type. In addition to this, it claims that all blood types are actually allergic to pork.

From what I understand, any allergic reactions are basically immunological over-reaction to some substance. Is this correct?

Is there any scientific evidence for the existence of pork allergies? I'm also curious whether there has been any correlation between semitic races and pork allergies?

Has anybody else experienced something similar?