Sudden, severe, temporary throat tightening

Over the years, occassionally I have this very weird reaction while eating: My throat starts to tighten up, severely and incredibly painfully. It closes so tight, I wheeze loudly when I breathe in, and sometimes am doubled over in pain.

It happened the other night again, this time the most severe it's ever been. I went to the doctor last year, thinking it was allergies, and he said it might be oral allergy syndrome, and told me to stop eating raw carrots (which were the last thing to trigger this kind of attack.) On Saturday, it happened while I was eating a hamburger. It's happened while eating leftover roast beef, a grain salad with cucumbers, tomatoes and feta cheese, chinese food leftovers, and once while eating a tuna sandwich.

I'm thinking it's not allergies. I usually take Benadryl when it happens, but it clears up within three to five minutes. I have an epi pen, but I'm scared to use it, because I'm not sure what will happen if it's not really an allergic reaction.

I go to the doctor tomorrow, and I'm going to ask for a referral to an ENT. But if this has happened to anyone else, and you have a diagnosis, I'd love to hear it.

Thank you.