Trouble breathing? 33+4

Vicki

Already talked to my OB about this just to get that straight. So when I lay on my left side which my son also sticks too I will wake up gasping for air (I don't have any sort of apnea outside of pregnancy) roll over to the right and it's like my lungs suddenly can open again. (That's the only way I can think to explain it) OB thinks it's him in my ribs on that side and told me not to worry too much about it. Anyone else experience this is or have any idea how to manage it? My right side is so much more comfortable so I'm a bit annoyed.