Has anyone on this site heard of atrial fibrillation? It is a type of heart palpitations and it CAN CAUSE FEELINGS OF ANXIETY. What might you expect if your heart is not beating correctly, and your body is sending adrenaline to try to fix things? Thus commonly causes this, but doctors frequently misdiagnosed, or just don't find it. Find a GOOD cardiologist and insist on being monitored, such as with a holster monitor. Also stay away from caffeine, which can aggravate it. Don't let the doctor send you away with no answers. A relative had this happen and had no answers until she was sent to the ER with obvious out-of-control heart rhythm problems. Intermittent palpitations can be cause of anxiety attacks and they ARE NOT psychological in nature. Once the arrhythmia is corrected, the anxiety suddenly disappears. Look it up.