Strange, everybody seems to have different ideas of what a "brain zap" is supposed to be.
I was under the impression that it is the feeling of a light jolt of electricity hitting your brain whenever you move your eyes too rapidly - atleast that's what my SSRI discontinuation syndrome was like. Oh, and there was this weird feeling of "dizziness" - well, not really the "normal", loss-of-balance/nausea kind of dizziness, it's more like your brain is mounted in some sort of gyroscope, trying to keep its orientation level whenever you tilt your head.
Anyway, the easiest way to get rid of antidepressant-induced brain zaps is to taper off slowly. Interestingly, the zaps sometimes can be staved off even with a different SSRI - I was coming off a high dosage of Effexor, and found that a Lexapro I still had lying around would immediately reduce the discontinuation symptoms.
No idea whether SSRIs can also help with serotonin-agonist induced zaps.
Heck, I remember that when switching from Effexor to Milnacipran (another SNRI), my discontinuation syndrome actually intensified.
So maybe your safest bet is probably to just sit it out.