Palpitations

I am currently 36 weeks pregnant. Lately I have difficulty in sleeping cus I feel like I cant breathe. I use two pillows and a neck pillow and sleep but it doesnt help. I keep having this palpitation aka anxiety setting in the middle of the night. Like I might not make it through the delivery of my baby. Anyone experiencing this? P.S: I texted my Gynae and he mentioned that its normal to have this breathlessness episodes