For the past year and a half I've been having trouble breathing. Chest hurts sometimes, especially when I bre?

breathe deep. Lately it's gotten worse. I've had some rattling sounds that come from my throat, seems like it's coming from my lungs. Sometimes though I feel like my heart may be also causing me problems. I did stop taking benzos recently and there are some bad withdrawals but I'm not sure if it's ociated. Is there a heart/lung doctor? Or will I need to see a lung dr. and then a cardiologist? thanks