Why do my lymph nodes in both armpits hurt for periods of time each day, but not all the time? I may have mild infection from a broken molar root that will be pulled 4/07/17. So, I got dentist to prescribe amoxicillin until then. Started Monday afternoon course, but feeling in arm pits continues. Age 68, female. Good health, but waiting to redo mammo that showed something last yr. left arm now tight. Due to worry? Unsure if I should get blood pressure checked at local pharmacy.