Definitely sounds like sinuses to me!!! I get them too. Do you have pain in your ear? If so, then I would go to the dr., because if it's an ear infection, you'll need an antiobiotic. I would stop the ear drops if they make you dizzy. That could also be signs of an inner ear infection. And I think your sinuses run along your jaw, correct? That could explain that pain. And the lymph node too, especially if it's on the same side. Whenever I get mouth ulcers (which is all the time), the lymph node goes up on that side under the jaw.
Hope I was of some help.