Most medication has to be tapered, though it can also be cancelled out by another med. The problem though is that when taking more than one medication, you never know what is causing what issue. You tell a doctor an issue with a medication, so they either want to increase the dosage hoping it will go away, OR, they then prescribe another medication to counter the side effects of the other medication. Ummmm.... really? That is their logic though, to treat symptoms caused by medication with other medication. Before you know it... you endup on a cocktail of meds wondering which day it is, let alone year... as your life becomes a fog and haze.
I would honestly be strongly asserting yourself for them to find you a singular medication that works with your body and does everything you need it to do, to a decent degree. Medication is trial and error, not one size fits all. You literally have to experiment with different types to find what works for you uniquely.
Doctors also typically start at the safest spectrum, which often have the most side effects, yet those are minor in the scope of side effects, before moving you to different drug groups which can be addictive and such, though typically work better with PTSD. Talk with him about trial and error of different drugs to find one that suits you... and don't accept treating side effects with another drug.