I have 2 caps in my mouth the one in the left on tooth 30 is hurting me they are on the same tooth on each side. What can I do?

This tooth has been caped since February 2015 and it is July 2016 it has been 17 months since I got them and they started hurting 2 days ago it is about every other hour it starts to hurt it is not all the time but I was wondering what all I need to do or I can do it hasn't been hurting today much it just hurt this morning when I woke up but that is the last time it has hurt me some times it won't for like 7 hours that is the last it has hurt me today.

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