Actually this medical complaint can go well undiagnosed for decades -- as it is a diagnosis of exclusion.
I am not suggesting anyone goes to their friend or family member.. with a check list--you have two gastrointestinal problem, one neurological and another of a different nature and therefore you must be suffering from somatization disorder.
But it can be quite debilitating when one is dependent on pain killers and has a poor rapport with their health care provider and lives like that for years just thinking they have a terminal illness that has gone undiagnosed.
So you are absolutely right-- there is nothing to be embarrassed about, you didn't know this-- but now you do..... And when you meet with a friend or a loved one that seems to have many complaints that have gone on for years, yet there is nothing organically wrong with them... you might suggest that the problem is psychiatric in nature rather than a pathophysiological one... And that they should seek a different kind of health care provider....
peace dear bros. and sisters.
wassaalaam