Two days ago i was at the dentist having a filling replaced. it was a large filling and the dentist had to use additional novacaine. I was in the chair for about an hour. After I was done, I went to my car and as I was sitting down getting my seatbelt on, I started having intense abdominal pain, my diaphragm felt rigid and i could only take shallow breaths. I returned to the dentist's office and they had me lie down and breathe oxygen. Although I can eat and digest fine, my stomach still feels very sore. Not sure what happened and how to relieve the pain. I am 47, 5'8" and 137lbs. No major health issues.