I am a healthy 28 year old male who doesn't smoke. I am active outdoors all the time. Just this past week the left side of my neck along my jawline has been bothering me. The throbbing sensation comes and goes. When it is present it is sometimes unbearable. In the middle of the night seems to be the worse. I also have noticed that I might have heartburn too, which has never been an issue before. Could these be realted? What can I do?