You may have came across the
1)Irritable bowel diseases- occurs mostly is stressed out condition being student it can be a possibility
2)Inflammatory bowel - like corhn's disease/ ulcerative colitis
comes bloody diarrhea but you don't have that
disorders - have you noticed any changes in food habits / dairy products? (because of green stool
, fatty content,sticky stool in history
4)worm infestation (already dealt with)
5)pseudomembrane colitis (due to prolonged history of antibiotics)
mostly likely it seems 1) malabsorption and 2) may be irritable bowel diseases.
And try to read about it and check for more relevant signs associated with those signs
and might want think about taking antibiotics as their chances of turning to pseudomembrane colitis (an infection with c. difficile )
Consult attending and let them help you rather then call in prescription from your brother as the can physically see the changes in You.
you may need some To diagnosis
2 stool culture, and microscopy
3)stool anti-c.difficile ab titer,
5)ultrasound of your gallbladder
and bile duct area.