First day at EFFEXOR 37.5 (Cross tapering from lexapro)

Hi I've been for 3 years on lexapro. Suddenly it stopped working for me some how. My psych suggested me to shift to effexor. Today i took my first dose 37.5 mg while tapering lexapro from 20 to 10 mg. I also took xanax for like last 2 weeks 0.5 mg daily. I came off it yesterday. So maybe these symptoms are telated to that I've been feeling : 1. My body feels electrified (i don't know how to explain this feeling but if someone can relate, he or she would know). 2. I'm having chills and goosebumps since i took my first dose. 3. Feeling Nauseatic. 4. My mouth is dry. 5. Feelings are kind of unreal.

Are all these symptoms normal at start or should I be worried. Pls help.. Thanks