It sounds like an allergic reaction, but the lump in the throat could indicate a mild anaphylactic reaction. Anaphylaxis can be life-threatening and your entire throat can swell up to the point that you can't breathe, if the reaction is severe enough. I would see a different doctor or a specialist, who can perform specific allergen testing, as it's probably something in your environment that you're having a reaction to. If it's bothering you, keep pursuing it with the doctors. Like I said, if you have a severe enough reaction at some point, it could be serious. Many times, if you have one allergy, you have many, so it's possible that something else could trigger a more severe reaction for you. Definitely see another doctor!