Just want to add to some of the comments here - my personal belief is that it's not necessarily due to being a Type A personality (in the sense of being highly ambitious, active, personable, etc) that is necessarily the cause for coming down with whatever illness has caused their SIBO.
That would just make no sense to me when clearly the cause of a lot of people's CFS issues are things like adverse gut health caused by antibiotic use or whatever, and there shouldn't be much correlation between that and a certain personality type, if any.
What I do think though is that Type A's might ignore early warning signs and push through, convinced some of their issues might have been in their mind and could simply be overcome by ignoring it and continuing with their active lifestyle, which ironically is the complete worst thing to do if the body is fighting off infection.
This was definitely the case for me at least. I was a high academic achiever at school and was very sporty with an active social life. I'm also a stereotypical male and had an aversion to going to the doctor unless I was basically about to die. So when over a number of years in my late teens and early 20's I developed depression and some pretty worrying cognitive symptoms I ignored it.
I think part of me didn't want to face the reality that there could be something seriously wrong with my health. I was also on track for a quintessentially "successful life", whatever that is, and had mentally prepared myself for that eventuality. And my whole sense of self worth was tied up in that need for achievement, so when it began to look like something might derail me from that course I was completely unable to accept it for fear of being a failure, until it was too late and I was left with no other choice.
It wouldn't surprise me if had I been less obsessed with this needing to be a high achiever I'd have been OK with seeking help sooner, and taking my health issues more seriously sooner, before it developed into something as serious as it ultimately did.
The second factor that I believe contributes to the high amount of Type A's on this forum is merely the fact that naturally driven and active people are going to be similarly driven to get themselves better. That means doing the research, finding the doctors, joining the forums, engaging in different treatments and ideas. I've no doubt there will be lots of Type B's (or less driven, lower achievers, whatever you want to call it) who have CFS, they're just not here, spending all their time researching and trying to fix it (which also isn't their fault, or even a negative - people are just different, and the world needs Type B's as much as it does Type A's).
Ultimately recovering from something like this will be the hardest thing most people ever have to go through in life and is probably a lot tougher than what the average person ever has or will ever experience. The mere fact you're on this forum engaging with people and actively trying to find a solution probably puts you in that top bracket of being driven and motivated.
