I'm confused about the Lyme part. Lyme isn't genetic, it's infectious.
As for CFS, I've experienced partial remissions before, without doing anything special beforehand, but if I'd just done something to try to treat it, I'm sure I'd think it caused the remission. Having a remission of CFS is great, and I don't think it takes anything away from that to think that doing something right before it caused the remission.
I once had a severe asthma attack right after taking a medication. It turned out the medication had nothing to do with the asthma attack, but I thought for awhile it did. It's that kind of thing. When people say that this might not be what really caused the asthma attack, or the remission, or something, they're not putting someone down (or they ought not to be, if they are they're the ones doing something wrong -- like the evolution in action comment... yuck, degrading people isn't necessary), it's not like calling someone stupid, it's just saying, it's human nature (in all of us, not just the person being talked to) to equate two things happening right near each other with one causing the other, especially if the intent was to cause the other or if it seems likely one would. Doesn't mean it did, and doesn't take anything away from the second thing if the second thing is a good thing.
_________________
"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams