I'm back. Sorry I've been away since last night but I'm back now.
Yes, you can "clarify" your statement by way of an affidavit and submit it. But that can be dicey. Your affidavit is of course sworn to be true, so while it trumps a KGB statement in many ways, you have to stick to the facts of the affidavit or else you'll be perjuring yourself.
I don't recommend that you do this without a lawyer. You could contact the accused's lawyer for help getting started, or for a referral for a lawyer of your own. While there might be an order to have no contact with the victim or with the accused, you certainly talk to the accused's lawyer.
A report from your doctor, counsellor, or therapist about a diagnosis for you would be helpful too. You aren't required to provide your medical history in court, although you might want to present something (if there's a trial) about your mental health. Doing so will open you up to cross examination by the crown of course. And the crown can subpoena your records or your doctors if it feels necessary.
I don't know what the charges are, or whether you are in fact the accused (I'm assuming not). If you're not the accused I would be surprised if the crown called a lot of evidence about you. If your KGB statement is its best evidence then the crown probably doesn't have enough to convict and they should cut a deal with the accused or withdraw the charges altogether, but that analysis and negotiation is up to the accused's lawyer not you.
I understand that your employment is in jeopardy perhaps, and whatever comes out at trial will technically be public and available to your employer too, so if you have drug use and mental health issues then getting more involved in the matter could have ramifications for you. I really think that you need a lawyer of your own.
Anything else to discuss?