Anyone have any tips to help my 4mo old out with his congestion? I've had to suction his nose out…

Anyone have any tips to help my 4mo old out with his congestion? I've had to suction his nose out about every hour and even when we flush it I still will have to suction it out again in an hour. He just sounds so miserable and you can tell he feels it too. He's got a Dr's appt in the am...