Paroxetine and Venlafaxine gave me similar reactions to the ones you described. The brain zaps are commonly described by users of a number of anti-depressants. Jerky leg too.
The "cockiness" and agression thing is interesting. I had this effect too. (I became so fearless on one occasion, I was arrested !)
All in all coming off years of different anti depressants gave me little trouble except for one of the old tricyclics (Imipramine) I was weaned off them in hospital and the night mares were horrific. I then started a combination of Lithium and an MAOI (Maclobemide).
The return of libido came with the SSRI medicines but sex is a little quicker than we would both like .
I've said this before, but anti-depressants are most effective when you combine it with education about your condition which, for me, was time spent in group therapy, reading and feedback from a psychologist. (Fortunately, free for chronic nutcases like me in NZ)