Shortness of Breath

Anyone had any success in overcoming shortness of breath? I was getting it occasionally if I laid too flat, but the last 24 hours have been miserable and I feel like I could hyperventilate at any moment. I'm only 34 weeks and the thought of 6 more weeks of feeling like I can't catch my breath is making me even more breathless! My doctor just said it was normal and told me to lay on my left side but was otherwise unhelpful.