I feel pressure which moves from under my nose, back of my head, to my neck and ears. Is it related to pinched nerve in my neck or recent dental work?

Unclear. Unclear from information provided. See PCP to start with.
TMJ/Muscle Problems. You may also have a TMJ or muscle dysfunction problem that is getting worse. There are times that a bionator (one type of function orthopedic appliance) may be of great help especially when using for sleeping as well as when you can during the day. This tends to retrain and heal the muscles to help them function normally. Find a dentist that is familiar with TMJ ; use of a bionator.