Hiya
You mentioned that you have had some treatment by doctors, have they given you any definite diagnosis?
I'm not an expert by any means but may of the symptoms you have described I believe are quite typical of a throat infection..you have also said in your second post that the pain in your throat has eased.
I would be reassured by your dentists opinion, he probably has more expertise than your doc at looking at mouth ulcers..if he thinks it is reducing, then it probably is. I know from experience just how closely linked the pains that come from ear/throat infections can be so this may be the reason for some of the symptoms you have.
As for the ENT, I see you are in Canada so am not sure how the system works over there. I believe in the UK you would need a referral from your GP before you could go to ENT, not sure how things work in the private sector.