Motrin is a anti-inflammatory so that is the best choice. I would keep that up and give it to him a half an hour before nap and bedtime. (Tylenol is just a pain reducer) Unfortunately, the pressure in his mouth is going to be worse laying down. But....the good news is they are probably have been budding (which is the most painful,) as they break through the pain should be gone. You are probably very close to that!!!. My kids LOVED popscicles at that time. We would even give them the frozen ice push-ups unopened and have them gnaw on that. I hope this is over soon for you. Sleep deprivation is the worse form of torture in my book