When do I switch migraine meds?

2 week ago I was prescribed amitriptyline for migraine prevention, 5 mg(half of the lowest dose available). While my migraines have been relieved even in a short time, the side effects are A LOT. Sedating, groggy and cloudy the morning after, heart pounding randomly, night mares, the list goes on. I've gotten serotonin syndrome from other antidepressants, so my doctor is having me do a med check in a few days. Should I see if something like gabapentin would be a better fit due to the side effects of amitriptyline?