Gosh! Your story sounds just like mine...literally (including age). I'm still dealing with the SIBO/IMO however and most likely it's time to work with a professional. Meanwhile...
...I cannot agree more re the stress. I'm more than sure that was/is the root of my issues - how it all started and I can almost map the flare-ups of symptoms with times of high stress. I've come to similar conclusions (weeding out negative, and keeping perspective) - also fortunate to have a caring, loving spouse who is with me through all of the ups and downs of this illness over the years.
Blessings to you!