At times my heart feels like it's beating really hard and my chest hurts a little then sometimes it's like it beats too slow. ideas??

Many . . .: Possible causes may include medications (including over the counter/supplements), drugs and alcohol, metabolic problems like thyroid disorders, poor sleep, problems with anxiety, or even problems with 'wiring' of the heart itself--although this is much less common. If this is something new, you should really see your doctor for an evaluation. Best of luck.