Sudden bouts of intense anxiety

I randomly get these sudden bouts of intense panicky anxiety, as if something very bad will happen.

I have a history of panic attacks and live with anxiety, not on any medications.

It's like my head is in a weird dazed and altered negative state. Can't seem to think of anything happy or positive. It's like I'm just mentally lost.

And than Every sensation inside me makes me think something is about to happen to me. I'm 28 weeks pregnant. Labour scares me, basically the fear of panic scares me. I'm just scared of my head and all the crap it comes up with. Yoga and meditation helps temporarily, and than its a struggle again. I'm scared of affecting my baby too.