I think I have the beginning of a common cold. Now I wonder, should I cure it while it is still very mild, or should I do nothing, let it be and see if my CFS will get better. Ludicrous decisions, sigh. I rarely get any cold.
I started noticing my ME/CFS symptoms fade around 24 hours after feeling the first symptoms of a cold, so at least in my case the response was pretty quick. Don't think it's worth waiting too much longer than that. Also the curative effect seems to depend a bit on the type and strength of the chronic infection. I once noticed a similar benefit from food poisoning, but other times in the past a minor cold haven't always triggered clear benefits. Hope you get "lucky" and get to enjoy normality for a while.