Yes stool exam for Ova, cysts & occult blood should help but you have already taken Anti amoebics & antibiotics. So, now you have to build up the good bacterias of GIT. You can take either curd about 1/2 katori 3 times a day or a medicine Sporlac three times a day. See the response, don't drink outside water, don't eat from out. wash hands anytime you eat anything even a biscuit,
Health Tips
Avoid fried stuff. Eat light. Don't lie down till 1 hr after meal