question: i have been having tightness/pain in my chest, neck, shoulder and back off and on for about 6 months.  2 months ago this symptom was accompanied by what felt like my heart flipping over in my chest.  This sensation has increased over the last two months.  For the last 7 days this sensation has happened about 10 or 15 times per day sometimes accompanied with tightness/pain.  I am 44 yrs old, female, and weigh around 190#.  I do not have hypertension, however, I do have a family history of hypertension and heart disease.  Could this simply be a sign of stress/anxiety, as my life does tend to be stressful sometimes, or could this indicate a serious condition?