I am on a holter heart monitor for 30 days. I have had lots of palpitations for the last 30 hours, and lots of, it seems, racing heart. I can walk a mile fast. I have no swelling. I have NOT been dizzy or faint. I had palpitations and fluttering prior to the holter monitor, but not nearly so often. Sometimes I lean forward from my shoulder on the left side. Sometimes I have left chest discomfort. I keep letting out little gasps of breath, barely perceptible to me, but a lady noticed today, and asked me about it. The monitor company said they are picking up my monitor readings, but the doctor did not notify me there are any urgent problems. I live by myself, and will be alone tonight if I have any major problems. Should I do anything?