Anxiety

So I've been off my antidepressants since about two months before falling pregnant. I'm now 17 weeks. I was on 200mg of Zoloft daily and I decided to just stop them without weaning off them. For the first few months I felt OK. But lately I've been getting multiple bouts of anxiety every day. I feel my heart stop and my whole body warms up and I feel I'm suffocating in my own body. I could be at home watching tv and this happens. It also happens a lot when I'm driving where I need to pull over. Could this be doing harm to my unborn baby? And also should I be worried about these episodes? What should I do??