Go to the GP. He/She can check to see where the infection is. i.e. ears/sinus/throat.
The dentist can only prescribe antibiotics for the inflamed gum - if it is infected.
Is there any yellow bulge on the gum or the inside of your cheek? Any Puss?
When you blow your nose is the mucus green?
This is an indication of a sinus infection.
Get some Sudafed from the chemist (remember you can only get one pack due to new legislation, so dont argue with them, they can not give you more)
The Doc can take a look in your ears for an ear infection, but if you arent allergic or dont have asthma/heart problems/kidney disease or stomach ulcers take some Ibuprofen and paracetomol together. Or take the Ibupfrofen first, then wait two hours and take paracetamol, just so the pain doesnt come back.
You will probably find that this will work really well if you have or havent got an infection as it will reduce swelling.
Remember DO NOT get the Sudafed with the paracetamol added, if you are already taking the paracetamol!
You can take the Sudafed with the Paracetomol if you DONT take any other paracetamol containing products.
Also, Drink plenty!