Anxiety/panic attack

So the other day I had experienced an anxiety attack. I've never been through one, but it was scary & I had extreme nausea. Lately I've been having nightmares since I found out that I'm pregnant, I've been waking up around 4 in the morning not able to go back to sleep. I worry so much everyday about my pregnancy because I've had a miscarriage & I don't want this pregnancy to end in a miscarriage. I'm just worried & all I do is pray that god bless me with my beautiful baby.