Ok I am no medical doctor, so I am talking about infections such as strep or tonsils or some time of sinus problem. No I can't be more specific on these.
Fungal such as yeast, try eating a serving of yogurt 2 x daily and see if symptoms improve.
If I had to guess I would say either, you have an impacted wisdom tooth, sorry my guess. Or that you have poked the tissue up there and caused trauma which has triggered a systemic reaction. This again is just a guess. Wisdom teeth are in a location that unless you are taking periapical xrays for a second molar, you may not see. Even if they are not trying to erupt in the gum, they can be facing sideway and cause a similar reaction to what you are describing.
I am sorry I can't be more specific with out an xray and visual exam. You don't have to accept, but I still think you should make a trip to a doctor. Sorry I guess it's the mother in me.
Another thought is if there is a dental college close to you, you can usually get an xray and exam for around 30-50 dollars. I know this may seem like a lot to some, but it is money well spent. If not then spend the money and go to an outpatient clinic or doctors office to have it evaluated.
Again, good luck and hope you feel better soon!!