Food Allergies?

SO, since I have started this whole weight loss chapter in my life, I find it very hard to eat enough fruits and veggies due to weird food allergies. Some veggies I admit, I just plain don't like, but upon reading on the net and such I found out actual food allergies are pretty rare in Adults.

Does anyone suffer from anything like this? could I eat it and take Benadryl? ( I know it sounds ridiculous, but I know people who do this for cats and such)

Here is a list of things I KNOW I am allergic to.

Cucumbers
Avocados :(
Raw/Fresh tomatoes
Raw carrots ( I can eat cooked ok though?!)
Pineapple :(
Kiwis
bananas :(

The symptoms are always the same, I start itching IN my mouth and my throat gets really itchy, and sometimes my lips start blowing up.

I DO/ can eat berries and squash, broccoli, onion, nectarines, asparagus, cooked carrots, lettuce, though some times when I am chopping it up I will break out in hives...

I DONT like mushrooms, or peaches, unless the peaches are baked, whatever.. I don't like the texture.