At that dose, metoprolol specifically is selective for the receptors in the heart and should not affect your lungs at all. At doses above 100mg/day is when I'd be concerned. (Other beta-blockers vary in their effect on asthma but metoprolol is a better one).As for Lisinopril I echo what the physician above said. It only causes dry cough and that would usually appear very early on when you take it. No effect on congestion.I personally had bad post nasal drip and congestion. Seeing a specialist helped so I'd suggest waiting for the ENT appointment.
I previously had an inhaler because I was waking up in the middle of the night not breathing. Did a sleep study and no apnea. I also go through episodes where I feel like theres so much mucus in my throat I cant breathe, but I always attributed that to anxiety.