Don't stop the antibiotic! That can lead to resistant bacteria and having seen that a lot of times in my professional life you do not want that. It also leads to antibiotic resistant diseases for the population in general. They are nasty.

If you think you can't tolerate the antibiotic call your family doctor and ask what to do or go back to the urgent care.

They won't put you IP for withdrawals unless you are suicidal or homicidal.