OP, if I were representing you in a civil matter, I'd ask you what (if anything) you did. If I were representing you in a criminal matter, I probably wouldn't ask you that question, as your answer might limit what I could ethically do for you.
In either situation, I would need to know what is alleged against you and what evidence is available relating to the allegation. I don't suggest that you go into such detail here, but you should be prepared to provide full detail to anyone who advises you.
If you are a member of a trade union, the union may be able to provide legal assistance.