I haven't exactly been in your situation but I have tried to hide my struggles from people around me.

My wife didn't know that I was engaging in self-injury. Nor did she know I was suicidal. Neither did I tell my friends or family that I wanted to hurt myself.

One day after a huge blowout fight with my wife (now ex-wife because of my mental illness), I revealed that I wanted to kill myself.

She felt so bad about it to say the least. She took the knives and pills and such out of the home with due haste. Not long after that, I attempted suicide. To this day, no one but myself and my therapists and doctors know about my suicide attempts... I take that back, I might have told my current wife that--not sure.

It got to a point where I could not hide my illness from others. Principally that was because I ended up in a psychiatric hospital. Even then, I didn't notify anyone that I was in a hospital as I watched everyone inside get visitors except me because I didn't want to tell anyone.

So I've been in somewhat similar situations with trying to hide mental illness though I am not a parent, my wife, also having mental illness, tries to hide that and her alcoholism from her son.

As for advice, I would suggest trying to get a doctor and/or therapist (or re-visit the current ones you have) and basically explain what you did here to them.

I remember very clearly the day my parents explained to me that my mother was diagnosed with bipolar disorder. I was 12 as a matter of fact. For me, it was both immensely troubling and immensely relieving since then I knew there was an explanation for her behavior towards me. I then knew that she didn't hate me but was sick.

You are not alone.