You poor thing - I hope Rich and chocolate are making you feel better.

If you can, you should try and tell the police and possibly, the bus company. I know it takes time and that you're worried they wont believe you, but you might not be the first. Your word will therefore back up others and might stop it or worse happening. The possibility of seeming a little foolish isn't half as bad as not saying something that might protect yourself and others.

Big hug x