My Grandfather had it, my Aunt suffered with it until she reached her 70’s and I have dealt with it off and on for 35 years. All the doctors say it is not inherited, I beg to differ. The last 13 years have been the worst simply because there has been no break. In the past I have had bouts that lasted for a year or two then had 3-5 years where I had no problem. This bout interestingly enough started right after I had a terrible case of food poisoning from eating some bad sweet and sour pork. I was sick for 6 days, lost 15 pounds and have been dealing with the IBS symptoms ever since. I keep hoping it will abate for a while again, but so far no luck.
I hope the MD tested for the basics...e.coli, h. pylori, celiac etc.