Root C after effects?

Ok to make a long story short, when i was about 11-12, i fell walkin up a slide, hit my tooth, and eventually needed a root c. I went to the dentist at about 13 to get it done, took some time to finish, or so the dentist i saw when i was about 17-18 said it was done. but ever since ive got it done theres been random pains once in a while, swelling of the gums above the tooth, and even this small bump like thing a bit behind the tooth, that swells up a bit, bleeds when i mess with it. is this anything normal for side effects? should i see a dentist again?