I had a bad uti in july and was on a lot of medication. the infection has gone but i still experience a bit of pain and frequently urinate. should i go back to the doctor?

Possibly: I would ask how you are sure “the infection is gone” if you still have the symptoms you describe? If you are sexually active, a sexually transmitted infection is always possible & should be tested for unless already done. Caffeine consumption & certain other dietary factors can sometimes cause symptoms like UTI so minimize caffeine & food additives