Hi.
Thanks for your query.
Noted the history and understood the concerns.
The problem os passing stool after whatever you eat at the age of 25 is usually due to wither IBS that
irritable bowel syndrome or any specific inflammatory lesion like
appendicitis or so in the intestinal tract.
This can be found out in the following way:
Get the stool tests done for three consecutive days.
Tests of blood, particularly for thyroid, CB,
diabetes and liver functions.
Ultrasonography and CT scan of the whole abdomen.
Colonoscopy.
If anything is found during the course of investigations or clinical evaluation by a Gastroenterologist or a Gastro Surgeon, you will have to get it treated specifically.
If all the investigations are necessarily negative then this may be taken as IBS and should be treated symptomatically as well as by treatment for the stress and anxiety as it surely help to get a good control over these.
Also identify the foods and beverages that instigate or enhance your problems so that a proper stoppage of these can help you better.
It can be a situation in life that is instigating in such a condition and you may have to changeover to get a cure.