At your age you still have the majority of your life ahead of you.
Do yourself a favor see a neurologist and get some proper tests done. Find out what your problem actually is and what caused it.
Then allow the professionals to advise you on the best course of medication.
Randomly trying this and that can cause all sorts of issues, stop doing it.

I agree with with Numbfoot. Its impossible to find specific answers to your case on a message board. Adverse reactions to medication are difficult for health professionals to diagnose with your complete medical history. Some random poster's similar experience with Flagyl may not be appropriate to you. I wish you well.