I've had pain when swallowing on & off for a month. there are 2 red patches at the back of my throat. sometimes i get pain when i move my tongue. help?

Needs to be examined: It's best to see your doctor, who can physically examine your throat, and look at these red patches more closely. Plus you want to document what is going on now. So s/he can help you with a working diagnosis, prognosis, and a plan of action. A month is long enough to see whether or not it would go away on its own. So it's time to get your medical consult done.

Pain, redness: Any pro-pharyngeal lesion that does not fully heal in 2 weeks requires further investigation. See a General Physician, a General Dentist, an Oral Surgeon, or an ENT for an examination and appropriate treatment.