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Could my primary PA hypertension be related to a food allergy I had once?

So, I was a perfectly healthy 18 year old, no food allergies, and very athletic. One time, I went out to a restaurant and ate shrimp fettuccine alfredo. About an hour later, my stomach hurt (pain scale: 8/10); hands and thighs started turning red, itching, and swelling; my vision and hearing disappered completely; and I became so weak I couldn't stand. I recovered, and was fine soon after that so I never saw a doctor about it. A couple months later, I almost passed out after 5 minutes on the elliptical, which was highly abnormal for me. The next week, I almost passed out after 30 seconds on the elliptical. Well, a year and a half later (August 2010) of doctor visits I was finally diagnosed with primary pulmonary arterial hypertension (PPAH). Every now and then a doctor will ask if I ever had a food allergy, and when I remind them of the allergic reaction (if that's what it was) I had, they change the subject and move on.  My PAH is primary (idiopathic) so they don't know what caused it, and I feel like they've given up looking. Could my PPAH be related to the food reaction I had, and if so, what action needs to be taken?
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Anything is possible but it does seem unlikely.

Have they checked for things like asd?
Helpful - 0
ASD as in autism spectrum disorders? I don't believe they have. Is PAH commonly associated with ASD? I haven't heard anything about that.
No, atrial septal defect?
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