Blood in stool. Me and what should i do?

Some times (may be 3-4 times in a week ) I found little blood in stool.it's not in pure liquid form or not dry. it started after I had taking medicine for tuberculosis approximately 2 year ago for 10 months.i discontinue my medicine approx 1 year ago.my stomach is also upset always after taking medicine.i have to go 3 -4 times for washroom(stool) in a day. My( LFT) report always show everything normal when I described medicine and also after discontinue medicine. I also go for sgpt test few months before that's also normal.my urine test ,cbc report , hemoglobin  all are normal. My weight is constant (59 kg) from 1.5 years. Also my Heath is normal. Please sir suggest me what is wrong with me and what should I do?