Hi Andrew, welcome
I know exactly how you feel in different circumstances. In your case I must thank you for not "blaming her" as mental health issues are complex and can override any sacrifices made by someones partner.
I suggest you visit a family solicitor, first visit is usually free. I'm unaware of your daughters age but in any case you have to protect yourself. If there is a way of communicating to your wife to suggest to her that she can make her own decisions with your marriage but you are entitled to visitations with your daughter. You are also entitled to apply for custody etc depending upon the situation.
Distraction is your friend at this time. Allow periods for grief of loss but stand up and get back into life, hobbies, sports, friends and so on. We call it "taking care of ourselves".
Write? As a poet I do a lot of it, it does help me.
Your value? At the moment you might be doubting you have value, I suggest you not lose sight of how valuable you are as a father and you might end up like me years after separation I walked my eldest down the aisle. I asked myself- "who would have done that had I not made it"?
You are facing several weeks of pain but it does get better.
IMO you have a good prospect with visits to your daughter and more so. A solicitor is the way to go. Any communication with your wife I suggest should remain as a friend, so the situation has the best chance of allowing your relationship with your daughter to exist with the least damage possible.
We are here, we listen and I'm glad you posted.
TonyWK
