Talk to Gastroenterologist on Diarrhoea Due To High Dose Antibiotics

On 15 july 2024 i got oprated for sebaceous cyst. After removal of sebaceous cycts which was at the lower back near to spine Dr advises me antibiotics i had 4000mg dose of medicine in a day for 7 days after 5 days i started getting loose motions which gradually increases what ever I eat dr gave me probiotics but it did not work also I ate imodium 2 days then it was okay for 4 days then again started then On 31 sep 2024 I had wisdom tooth extraction then again I took antibiotics for 5 days in this time i often get loose motions sometime less that 5 sometime 10 then I went dr he gave me spratex and flagal which work good for 5 days but again I was not getting periods I used medicine for that now from 2 days i see blood in my stool also on my clothes what should I DO i am too much worried