I take a lot of vitamins and supplements. On occasion, I have experienced an irregular heartbeat as well as skipped beats. I take atenolol, 25mg a day, for blood pressure. It has an added benefit of regulating heart rhythm. Increased dosage of this drug causes me dizziness and near fainting. In the past, I had a heart procedure (ablation) done to correct an extremely rapid heartbeat. For the past several days, I am again experiencing an irregular heartbeat, a fluttering feeling, and skipped beats. There is a general feeling of fullness in my upper chest, but no pain. I do experience stress, have arthritis pretty bad, and have a lot of pain with that. I do not take any pain medication. I am a 65 year old female.