I am so sorry to hear that your son is not feeling well. You can call your doctor and see if they have any cough medicine for him, Ibuprofen and Tylenol are designed to bring down a fever, so they aren't going to do anything for a cough. You can also try warm tea with lemon and honey, there is a reason that this is a go to for parents. Also, run the shower and steam up the bathroom and run a humidifier in his room. If that doesn't work, bundle him up and bundle yourself up and sit outside, so that they can breath in the cold air, this should also help. If you have a phone, I would take a videotape of him coughing, at night and take that to the doctor. It helped my doctor diagnose my daughter's asthma.