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It sounds like you did well on the Paxil but since you have been off you are having some issues. You are normal, many people have these same issues. :)
I would suspect your heart flutters are PACs. As the name suggests, premature atrial contractions (PACs) are contractions in the atria of the heart that occur too early in the rhythm sequence. Abnormal electrical impulses signal the atria to beat prematurely. PACs are very common and can happen in otherwise healthy persons. Most persons who have PACs never notice them. Because PACs occur out of the normal rhythm, this condition is an arrhythmia. The physician may notice an irregular pulse, or the PACs may be found on an electrocardiogram (ECG).
A palpitation is an abnormal awareness of the beating of the heart, whether it is too slow, too fast, irregular, or at its normal frequency. The difference between an abnormal awareness and a normal awareness is that the latter is almost always caused by a concentration on the beating of one's heart and the former interrupts other thoughts. Palpitations may be brought on by overexertion, adrenaline, , or as a symptom of panic disorder.
I hope this gives you a bit of info and I am glad you are going to follow up with a cardiologist as that is a wise thing to do. It will put your mind at ease to find out what the cardiologist thinks.
A warm welcome from all of your A & P moderators. We are glad to have you with us.