Thanks, I appreciate the congrats! Finding the acupuncturist was a step forward. :)

Regarding runner's high, I'll throw out an idea as good for thought... maybe be more subtle than what you're expecting... if you're not able to run for a few days, how do you feel? It could be that rather than feeling an endorphin rush (think of waves with high amplitude, low frequency) your body releases them at a lower rate (lower amplitude and more in the background), such that if you don't get your exercise (and related endorphin dose) you miss the feeling?