Slim is better than zero. I did stumble across a cure for my PEM. I certainly wouldn't have expected a common spice to 100% block PEM and then cure it, but it did. I've stumbled across other treatments that worked for specific problems. I haven't bothered to try prescription drugs for years, but I still occasionally try a new foodstuff, simply because I don't 100% know that it won't help.
That's the case with my present GP. He accepts my claim to having ME, but admits he can't do anything about it. He may write an experimental prescription for me, because I so rarely do so (showing I'm not a drug-chaser). I don't expect to find a better doctor than that regarding ME.