Could it actually be allergies?

Hi there

I am new to this part of the forum, usually hang out on fibro and CFS forum as over the past year that has been the worst part of my problems...

However, for months now I have had this mouth / throat / tongue problem, which i actually always attributed to CFS but now I am wondering if its actually an allergy causing me this misery...Let me explain:

It always feel like I have a dry mouth /throat..i always have sore red patches at back of mouth, where soft palette arches around and just recently i have had really sore side of tongue...I got dentist to have a look, and there is little spots there
Some days the soreness isnt too bad, others its agonising...It feels like it burns / when i breathe air it feels like it burns down my throat...certain citrus foods aggrevate it
I thought candida, i dont have a massive white coating on tongue, but little bit...i was tested by doc and the swab came up negative...I also thought reflux, i get little foamy bits of saliva at sides of mouth at back of throat - that feel lke they sting a bit

Doctor mentioned allergies, but this could be anything...I already have hayfever, but it feels different to that and is all year round...I have just tried going gluten free in case its a problem with gluten

Im on amitriptyline 25mg for the fibro / cfs...if i have either....and a whole host of supplements...Now im questioning could the supplements be doing this??

I know it literally could be anything - but how do you start with something like this? Does it sound familiar or like an allergy to any of you?

By the way - im in UK and doctor didnt mention about seeing an allergist etc

Thanks for any info :)