36 year old female having fast heartbeat and blood pressure is elevated. upper back hurts and lower stomach feels like its vibrating and pressure..ekg normal and chest xray normal. scared of heart attack/sca?! help reassure me. anxiety high!?

The description provided does not have adequate detail to make a diagnosis and reassure. The only way to answer your question adequately is to have you be evaluated by a physician who can do further tests if indicated.

I recommend you keep a diary to see if you can get a better idea of what is causing this. Food? Exercise? Stress? Share with your Dr. My guess it is an anxiety issue and discussing it with your Dr with diary in hand will help relieve this. Heart attach would be VERY rare at you age. The best way to prevent one is to get your BP into a healthy range say below 120 systolic. Discuss.