I've been taking 15mg a day, 7.5mg in the morning and 3.75mg (half a 7.5 pill) in the evening and night. I have insomnia, with symptoms of being 'startled' awake by my brain, whether it's a physical twitch, or a zap like sensation in my head, or just a sudden wakefulness. These symptoms finally went away and I hadn't had them for a few weeks. About two weeks ago I started tapering off Buspar, mostly because 7.5mg hits me with dizziness pretty hard even with food, and I had a few doctors by this point say maybe the Buspar wasn't really working for me, so I decided to start tapering off and see how I do. 

I've been reducing the dosage by 3.75mg every other day, taking it off the 7.5mg in the morning. About a week after doing this I'm suddenly getting brain zaps and head twitching again as I'm falling asleep, but no other withdrawal symptoms yet. It seems like such a low amount to cut but I don't know what else could be doing this, unless my insomnia is just being an asshole. The only other thing I can think of is the Buspar was treating the physical anxiety symptoms and now the dosage is too low?? Any insight would be appreciated.