Yes, I would say they are food allergies or sensitivities. Even though the RAST test should no allergies, that does not mean you don't have them. They are not always that accurate. The burning in your mouth is a sure sign of an allergic reaction to a food. I would do my own test, avoid the offending foods for a weeks or so, see how you feel, then, add each one back in slowly, give each one a weeks' trial, if you have reactions of any kind, then you will have your answers. Also, you can test your pulse, if it raises twenty minutes after you have eaten a food, again, that is indicative of a food allergy reaction. Take the pulse before you eat, then 20 minutes after, if it is 10 to 20 beats faster, you have your answer, an allergy to that food.
By the way, for some reason, Kiwi fruit allergies seems to affect alot of folks.