Agree: I'm IBS D + C diagnosed. Mine was inborn. I've always had a problem that gotten worse after certain other medical conditions came into play.
IBS D + C is horrible, embarrassing, degrading, etc, but as you say, it's not a killer.
In mu case though it is not diet related, which is more unusual than usual.
It is related to having a twisted colon (medical name is torturous/elongated/redundant colon), which doesn't lay as it should. Diet health doesn't work for me.
Though obviously a decent diet is far better than an unhealthy diet in this as any health condition
I also have D with this, which is more unusual with twisted colon as it's usually C only. However, I've both.
Like you, medical advice from the correct people is the only way forward. I'm not saying alternative can't enhance treatment. However, it must never be used instead of medical advice and should be checked with your GP/medical consultant.
That is the same for any condition. The number of people who think they know more than the medical profession is unbelievable. I know that with my other conditions, too