Coming from Effexor

I feel awful, I felt weird while on Effexor and had to switch because of constant brain zaps , weird feeling in head & muscle jerks. As of right now I’m on 37.5 mg of Effexor every other day & I’ve been on pristiq 25mg for 3 days. I don’t know which is what. My doc told me I could go without effexor if I started feeling weird but I became severely depressed & felt unreal and developed crying spells. My symptoms now are hot flashes which I had while on pristiq, blurred vision, dizzinesss, nausea, overall feeling that I’m going to pass out. My head hurts & my sinuses are soooooo dry. Any advice? Or has anyone been through something similar..