I have a very slow heart rate (44 bpm) and it beats irregular. should i worry?

Get an ECG /monitor: A normal heart rate is typically in the range of 60-100 at rest. That said, many normal people can have deviations fom that. A pathological heart rate/rhythm is best determined by an ecg/cardiac monitor. Also-whether symptoms exist (like fainting or near-fainting particularly when you are trying to do something), your history (congenital heart problems, murmur/bp issues/mom w lupus)-cause block.

Symptomatic?: Do you have fainting or dizziness episodes? Ever had an echocardiogram to check if you have structural anomalies of your heart? You might benefit from a session of multifunction cardiogram. It compares your heart's complex electrical activity patterns to a 40, 000 people's database to help the doctor to come up with an accurate diagnosis. http://en.m.wikipedia.org/wiki/multifunction_cardiogram.