Swollen sore throat, migranes, swollen gums and a high fever? what causes this?

URI: Upper respiratory tract infections, whether due to viruses or bacteria, may trigger migraine headaches in a susceptible person. Swollen gums, if due to gingivitis, will probably need treatment with antibiotics, but to determine this accurately will require a visit to your doctor and a good examination.

Viral infection: These symptoms may be caused by an oral herpetic infection. It is best to see your dentist or physician for an evaluation.

Germs: Have your md see it. It sounds like an infection of some kind.