I have anxiety and have tried Zoloft, paxil, prozac and now lexapro. My anxiety symptoms are dizziness where I feel like I will pass out, heart palpitations, tremors and visions issues along with balance problems . 
I was prescribed these all on low doses was told it will take 4-6 weeks, so be patient the problem within 2-3 days of taking them I feel so bad and my anxiety gets worse I'm forced to stop taking them. The only thing that works is Ativan and my GP said he will not give me a new. Prescript. Because it can be addicting. I talked to my GP and he said if these meds don't work then he suggest CBT . Has anyone else has problems getting used to these medication.
These symptoms are so terrible esp the dizziness and tremors but was told it's anxiety sometimes I'm afraid it a neurological issue or a seizure I'm getting how it feels.