i think you have a infection you should go and get some antibiotics .
Sounds like you have an infection. Did you have the dental work done before these symptoms started happening? What kind of dental work? Was it a crown or root canal. If it was you could easily picked up an infection from this. If you did have the dental work right before your symptoms I would call the dentist and inform him or her of your problem. Especially tell the dentist about the swelling and fever.
sounds like you are coming down with something,try taking some paracetomol to lower your temp,the dental work prob havent helped things