It is very common to cough a lot after you quit but if you have a head cold at the same time, you may need to slow down your activities and give yourself a chance to feel better. I am a big fan of mucinex, the generic version, because it thins down any mucous and helps you to get it up. I also recommend EmergenC with immune support but I don't take that at night because it wakes me up...not sure why. Drink lots and lots of water, also orange juice if you can. Be patient with your body, it has some recovering to do and it's cleaning house. If you don't feel like you are improving in a day or so, I would have a doctor check you out and listen to your lungs and make sure you don't need something more, like an inhaler. Whatever happens, not smoking is the best thing you can do for yourself.
Ellen