Will my previous "suicide attempt" affect my chances of getting this job?

A job I have applied for requires a psychological evaluation and extensive background check. I suffered with depression all through high school and in 2011, I overdosed on antidepressants, went into cardiac arrest and was in the hospital for a few days. It wasn’t quite a suicide attempt. I didn’t plan it, I didn’t leave a note – I was reacting to a situation that set me off and I took too many pills and as soon as I took them I called the ambulance as I realized my mistake. I didn’t have to have follow up appointments or anything. I immediately stopped taking my antidepressants altogether and my life is substantially better. I am not depressed or anxious or anything. My life is normal – but now I’m afraid my past will haunt me. Will they hold this against me? I don’t know what is in my files or what they can find out. Do I have to disclose this?