anxiety meds during pregnancy

I am 13 weeks pregnant with baby # 2. I have suffered with Anxiety disorder (GAD) almost all of my life. I can remember having full blown panic attacks in middle school. I can remember having anxiety even at elem school age. It got dramatically worse during and especially after having my first child. J had to start taking Zoloft. I've been on and off Zoloft since beginning of 2015 but quit taking it just a few months before finding out I was pregnant. Anxiety has been awful through this pregnancy again to where I'm even having dreams of bleeding profusely and miscarrying the baby. My DR suggested going back on my Zoloft through out my pregnancy but that makes me nervous being there is t much studies on how anxiety medicine effects the baby. Wondering if any ladies on her have any experience with anxiety and how you treated it through your pregnancy?