I just cant breath 😢

Feeling pretty down, I've had a pretty smooth pregnancy up until about a month ago, where i feel like i can't breath. This is baby no.6 and I'm 30+2 weeks I've had this in previous pregnancies but not as bad as this, i can't get anything done without feeling like I'm going to pass out if i don't sit down. Anyone got any suggestions to help ease this? Its making life really difficult 😢