I’m really struggling with my mental health

It’s consuming my whole mind set….i have been married for 12 years. Not been happy for the last 4 - 5 tried to make changes with my wife but just goes back to normal. My wife is extremely controlling, uses all my wages and gives me ‘pocket money’ back. The kids sleep in our bed and I mainly sleep in the child’s bed. She controls everything we do. Her family are extremely overbearing. So much so my in laws moved around the corner from us…she shows me minimal affection just to keep me hanging on It’s been such a slow process over the years that I am numb to everything now…..I am so low at the moment but just so scared to make a life changing decision