Going insane!

This is my second pregnancy. I had a completely normal and healthy pregnancy with my daughter (born 04/14). I had pretty bad PPD with her and finally weaned off the medication in Nov. 14. And I felt 1000% better. Since finding out I'm pregnant again my anxiety is through the roof. My hubby bought a Doppler to ease my anxiety and fears, but now it's not even helping. I had multiple dreams the past few nights of losing our baby. It doesn't help matters that I couldn't find the heartbeat last night! I'm not sure what to do, my next OB appt is Monday but they are only going to check the heartbeat with the Doppler as well. I swear I'm going insane because I never had any anxiety while pregnant with my daughter.