My wife said something that terrifies me.

For backstory and context, when my wife and I first got together, she admitted she had no desire to have children due to 2 previous miscarriages in her last marriage. 4 years and a wedding later she came to me with the desire to be a mom. A few months later and she was pregnant. He was a happy healthy boy and everything seemed great at first. I slotted right into being a dad and he's my little ray of sunshine.

My wife developed terrible PPD exacerbated by pumping anxiety. During a few arguments caused by her being overstimulated, she's admitted to me that she feels no emotional attachment to him and that he's just a child living in our home. She's been going to therapy and things seemed like they were getting better. Don't get me wrong, she's an amazing mother, always makes sure he's well cared for and has everything he needs or wants. But it's obvious she doesn't feel connected to him. Today, after a few particularly stressful days where he's been very needy and crying constantly (due to teething) she texted me while I was at work. It read "He's pushing me to the edge. This morning I just wanted to put him in a hot car and walk away. I'm ripping my hair out and I'm in the middle of a mental breakdown, I just can't do the crying anymore." I immediately made sure he was safe with my mom and arranged for her to watch him overnight. I talked with her more and it seems like this is just an out of the blue manic episode. I'm just terrified of what happens if she has another and she acts on those feelings. I don't know what to do here and it's killing me inside.