I am having a irregular heartbeat & throbbing/cramp pain near the left side of my chest. doesn't hurt but feels weird cuz it's near the heart anxiety?

Test to rule out: Has this been going on for awhile or is it sudden? Are you under a lot of stress? Have you had palpitations before? An EKG should probably be done at your doctor's office to make sure the cause is not your heart. If you feel a heaviness on your chest, have shortness of breath, pain in the arm or jaw, please go to ER. Those can be common anxiety symptoms as well. See your doc to be sure.

Panic attack: Do you drink "energy drinks"? If so it is the Taurine causing this. These dangerous products are very hard on your heart. Or, this is your chest telling you that it is exhausted carrying the stress and anxiety without relief. Either way, get some rest. Don't drink caffeine or other "energy" products.