Pregnancy and anxiety attacks. Scared!?

I'm 5 months pregnant and have been experiencing what I think are anxiety/panick attacks for 6 months now. They come and go, but I don't really have any physical symptoms. Only panick in my head. Could it be pregnancy related?? I thought it was gonna get better in 2nd trimester.;( but not. Also I have mild mood swings throughout the day. Sometimes I feel depressed due to my anxiety and not being able to relax. ( my anxiety started one month before I got pregnant due to stressfull job, and planing a baby I think) . Has anyone experienced anything similar? Did it go away after the baby was born? Sometimes it's so overwhelming and scary.;(