Breathlessness in pregnancy

I’m 26 weeks and lately I’m really struggling to catch my breath. I’m asthmatic anyways and have a consultant led pregnancy but it’s getting unbelievably uncomfortable now. I can’t even lay on the sofa without feeling like everything’s being squeezed, kind of like my lungs can’t expand and then my ribs start hurting.

I know its normal, but I just wondered if anyone has any tips to help it? I prop myself up at night etc and I’m still uncomfortable

Thankyou x