A.M.
Definitely use the humidifier. If he's really congested, saline drops/spray should help losen everything up. Don't feel bad about pnning him down and sucking it out. Sometimes it's necessary. Prop up the end of his mattress where he lays his head - put a pillow under the mattress at that end - so his nose can drain. Take longer baths, a little warmer than usual, so he can breathe in the warm air or sit in the bathroom with him while the steaming shower runs for a couple minutes.
I hope some of these ideas work. Again, don't feel bad about the pnning/sucking. He's too young to have any permanent emtional scars from it! : )