I'm really struggling with my breathing lately. I've got this constant congestion in my chest, and it's there all day long. It's so bad that even yawning is tough. When I lie down at night, I feel like I'm choking and can't sleep. I saw a pulmonologist who thought it might be an allergy, and I've been taking the meds he gave me, but nothing's changing. Do you have any advice on what I could try next?