Two days ago I took 1 10 mg dose of Lexapro. I had a bad experience that may or my not be related ti it, so I didn't take another one yet. I didn't think I would have a bad withdrawal since I only took it once. Almost two days later, at 3 am, I am having those electric shock feelings in my head, what some here call "brain zaps," which then gives me a rush of adrenaline and panic and keep me up. I need some sleep! I need to work in the morning! How long do "brain zaps" last? All night? Longer? Or do they go away quickly? They only happen when I try to sleep, ionically. I also just took a Benadryl for my head and ear congestion. A pharmacist told me it should have no interaction with the Lexapro. HELP!