I twisted my ankle and it won't stop hurting?

Ok so a few months back while i was drunk i was walking backwards and fell back on the stones and when i got up i couldn't walk properly but only hop on 1 foot. The next day it was swollen, bruised and i could not put weight on it. Now a few months on: the bruising and swelling have gone down but the pain has not, and i still can not walk on it properly?