What Is The Remedy For Vaginitis?

Hi Doctor, I have vaginitis and I was given vaginal tablet by my doctor but I get scared when i insert the medicine because i'm a virgin. The visible hole in the vaginal seem very small. After i succeeded in using the drug, i felt severe abdominal pain and I began to have diarrhea, this made the medicine i inserted fall out of my vaginal. Please advice me on what to do. What is the exact problem? did i insert the medicine properly? Should i stop using the medicine (imidil vaginal inserts 100mg)