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What is this bubble thing on my gums, above my tooth?

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Okay, So about a year ago, my tooth broke and the dentist told me I need to have a root canal. (still hasnt happened) and about a month ago, this hardish bubble thing appeard above the tooth on my gums. and my teeth hurt everyday. sensitive to warm AND cold water, food, ect. and hurt when I chew

after a month, it quit hurting. Then. A couple times when I woke up, there was a head on it. and I poked it with a needle and some pus came out.

(I know this sounds really disgusting, but it happened.)

but, the bubble still stayed. it hasnt came to a head again. but my tooth is starting to hurt again.

does anybody know what this could be? Thanks so much!