The discomfort after a check-up appointment to change the archwire and the elastic ties (with conventional braces) is negligible compared with the discomfort in the first few days after braces are fitted. Patients very rarely need to take painkillers. The most unpleasant part is getting used to a newly fitted elastic chain for closing gaps between the teeth.
This answer is for general information. Your own case needs an examination by an orthodontist.