I have this extreme pain in my gum?

Tooth abcess: You probably have an infected tooth in which the infection has traveled down the inside of the tooth to the root canal. You should get this evaluated by your dentist as these infections can enter the bone near the tooth root and be of considerable pain and risk.

Extreme Pain: See your dentist asap to determine cause and treat the problem. Take some OTC pain medication meanwhile. Even if the pain subsides it's important to get treatment asap as infections can spread quickly and result in serious complications.

Caused by?: It's best to treat cause, not just symptoms. To that end your Dentist will have to see you for examination/imaging to determine cause of pain. First, call for examination. Second, take OTC analgesic exactly as per package directions until your appointment. Even if pain temporarily subsides you must by seen by Dentist as cause may be infection, which can be quite dangerous.

Gingival Pain: An exam would be needed to determine the cause and the proper care. Please see a local dentist.

See a dentist: too many thing that could be wrong. You need an examination and diagnosis and that needs to be a hands on process by a dentist.