Thanks for the info and advice - I had read about the absorption problems caused by dietary protein, so I've tried restricting protein to only the evening, doing away with it almost completely for a couple of days, and eating very little of anything during the course af a day to see if I experienced any differences. There's either no difference or it's so subtle that I'm missing it.

My walking doesn't seem to vary that much over the course of a day - I find that I'm a little clumsier in the morning, but not significantly.

I've been expecting a significant change in the symptoms in response to the medication, and what I'm reading into your comments is that it may not be as clear-cut as that. I know that diagnosing this illness is difficult - perhaps I'm just looking for a level of certainty that's not available.