Thanks for writing your query.
Bile juice secreted by gall bladder
helps in digestion of fats. You should avoid fatty/oily foods after gall bladder removal.
Your symptoms are suggesting more towards infection of the intestines resulting in mucus and blood along with stools.
You should get your stool examined for Routine/microscopic and for Occult blood.
You may need antibiotic and antiamoebic according to the reports of the investigation.
Also take an antacid
Have light meals with less spice and oil.
If your problem persists, get yourself examined by your doctor.
I hope this is helpful to you.