Anxiety issues

About a week ago, I started having really severe anxiety about my own mortality and watching my toddler grow up and getting ready to give birth has not helped this. I don't get as anxious when thinking about not surviving childbirth but it does cross my mind a few times. The past three nights I've had these anxiety attacks and sometimes it takes a lot to calm me down. I won't even be thinking anything about it and my mind will just go to thinking about it. Sometimes just looking at my toddler triggers it. I don't know what's going on with me :(

I used to struggle with the same anxiety when I was like 16 but it's come back all of a sudden. Didn't even happen with my first born. :/