Have a look at the ORAC powder you're using. I felt great on the one I was using for about a day or two and then on day three was slammed with immense FM pain and other symptoms. Turns out it was full of various digestive enzymes and Lactobacillus acidophilus, both of which are contraindicated in ME/CFS in my opinion.
I was using Amazing Grass (stopped it recently while trying to cut out things that might be giving me migraines). Actually, now that I reread the label, it's probably the same one that you tried:
http://www.amazinggrass.com/store/green-superfood-berry.html
and yet I did well on it for three months (until the coconut disaster).
Of course, VSL3 is chocka with l. acidophilus and I improved while on that for three months (until this reflux thing).
Very hard to know what's good and what's bad, if things take a long time to go to the bad (and even then, there's no telling which of several things could have been the culprit - might even have been the calcium carbonate tabs).
I must say that even though my OI has improved again, I don't feel the increase in stamina that I did pre-coconut. I wonder if that could be the acidophilus.
What's the issue? Lactic acid?