HELLO, WELCOME TO HCM,
As per the details u have given, it seems you are having more of BACILLARY/AMOEBIC DYSENTARY..but to rule out the exact cause ,
i advise you the
1.COMPLETE STOOL ANALYSIS..this will give entire details regarding any parasitic infections/ worm infestations/ infection ...
so consult a genaral physician , and have done your stool test
, and ultrasound it will give better idea about the problem..