Trouble breathing when sleeping ? Help:(

Kyleigh • It's a boy!🌱🍼🐻 Born: 2•17•16
I'll wake up gasping, like someone clogged my windpipes. And I have a lot of flem in my throat that adds to the sensation. I feel like I'm dying. My husband says I've began kicking and twitching a lot in my sleep too, he thinks it's "probably related to the fact that you can't breathe well".
This has started noticeably this past week, gotten worse the past 3 days. I'm at 20 weeks. 
Help?!