While the elbow pain is an issue (may be a hairline fracture), I would call your attention to why you tripped.
Usually, it is when we are fatigued, distracted, ill or injured that we make motor skill mistakes like this. This would indicate that perhaps you were over-doing it or that your run was ill-timed or too ambitious. Life has ways of getting us to take it back a couple of notches if we are not willing to do it voluntarily. I do not say this as condemnation. Conversely, I greatly admire your return to running. You must interpret the true meaning of this event, though.