Bad pain in tooth two years after root canal and crown?

My tooth has had severe pain for the past two weeks. I was taking some left over antibiotics that I had left from another tooth I got fix. They helped for awhile but the pain came back. What could be causing it. The tooth hurts to the touch so much I can not chew and it has a throbbing, stinging pain. I have... show more My tooth has had severe pain for the past two weeks. I was taking some left over antibiotics that I had left from another tooth I got fix. They helped for awhile but the pain came back. What could be causing it. The tooth hurts to the touch so much I can not chew and it has a throbbing, stinging pain. I have another monh before my insurance kicks in. How will the dentist fix this? Is it possible the tooth will need to be pulled. Will another root canal need to be done? Can they do it without me having to get another crown?
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