Hi thanks for asking question.
You have
blood in stool, so better to first get your stool examination.
1.If along with bacteria , pus cells seen then possibilities of
bacterial gastroenteritis or dysentry like infection.Antibiotic needed for it.
2.Second stool may reveal parasite egg or trophozoite.So according to infection treatment needed.For example if amebiasis present then metrodinazole required.
3.Thirdly bleeding may be because of
peptic ulcer.For that
omeprazole given for 4 week.Endoscopy examination may needed for it.
4.For rulling out liver condition do your serum liver enzyme study like SGPT or SGOT along with
ultrasound examination.
Meanwhile drink more water with fruit juices.
Do above aspects as preliminary approach in your case.
If you want to consult then you can consult another gastroenterologist.
I hope my suggestion will helpful to you.