The only problem about going thru a doctor is moving. If for some reason you have to switch doctors the new doctor will almost always require testing done under his supervision. AKA you will have to go off, feel like a bag of shit, go thru lots of bloodwork then get put back on lol. They all want to cover their ass.
This has happened to me 2x, the second time I said fuck it bailed and on the appt. I was tired of feeling like a lab rat.