Hi Skobe, and welcome to anxiety zone
As far as I know, that sensation doesn't sound like a heart attack. I think there are all sorts of issues, many minor that could cause temporary sharp pains in your elbow.
I understand that in some circumstances heart attacks can cause issues in the arms or left arm, but I imagine it would also be accompanied by other strong sensations or pains elsewhere, and i have a feeling that in most cases these sensations and pains would be absolutely overwhelming. Also the fact your pain is coming and going in spurts doesn't sound like a heart attack to me.
I hope the issue resolves on its own soon. Feel better. :)-Ravens Lady