I would definitely talk to the doctor that prescribed you these medications but I know exactly the type of feeling you're talking about. For YEARS I was taking Celexa and then the generic version of Citalopram and there would be nights where I would forget to take the pill and the next day, I might have that 'zapping' feeling once, but the next day it would be more frequent and then third day would be really frequent. It was the sudden lack of SSRI in my system. So in my opinion it's definitely because of the meds, most likely because you stopped after taking them. It's a very common side effect of going off or getting used to an SSRI so try to relax about it, but you'll definitely want to talk to your doctor so that they can work with you to figure out what needs to be done to stop them all together.