Welcome to Healing Well. I am sorry you are having trouble with your insurance company. I don't know much about things like that as I'm from the UK and we have a national health service here.
I'm sure your doctor will change your meds if you feel they aren't working for you anymore. You may have to have a few days break inbetween stopping the wellbutrin and starting a new antidepressant.
Post here anytime, we are happy to have you.