What Causes Dull Pain Below My Right Collar Bone?

Hello and Merry Christmas. the last few days, I ve been having a dull pain below my right collar bone. It comes and goes, but i feel a few times a day. I can only describe the pain as if you have a menstrual cramp, but it s just not in my abdomen. Also, the last few days, I ve been waking up as if i have something heavy on my chest. I m not having a hard time breathing though nor do I feel any pain in my chest, nor numbness or tingling anywhere. I m aware that heart attack are normally related to left arms, shoulders, chest, etc.