I think i may have a possible root canal, what to do?

See a dentist: You should call your dentist to have him/her evaluate the tooth and then give you your options about any treatment needed for the tooth.

See dentist: Don't try otc home therapies, etc. Without getting a professional opinion on what you might have.

Call Dentist now: Before it becomes untreatable, call your dentist. Your dentist will evaluate your problem, choose the best course of treatment based on training and experience, or refer you to the correct specialist. Don't make things worse by trying to do this yourself. See a pro.