You poor love.
If you are very ill in hospital, need rest and are vomiting, I'll take an educated guess at what it might be, but hope it isn't terminal.
I bet you don't care about the house, nanny, schools, holidays, cars or even your husband particularly. A suicide might even feel like a (complicated) relief. I bet you are numb and just wish you could go to sleep then wake up with it all sorted out. I bet you don't know where to start untangling everything. I bet you feel you have the weight of your children's wellbeing, the nanny and your husband's commitments all on your shoulders.
I bet it all seems insurmountable.
It takes a woman eight attempts to leave an abusive man, I think? An abusive addicted man would be even harder to leave as they are Class A Manipulators.
An anonymous service like Women's Aid or NarcoticsAnonymous might be a really good starting point. Begin by collecting information - knowledge is power and it will help to clear the fog. You will find you do have choices, though they will all probably feel like equally shitty choices to begin with.
Wishing you a speedy recovery so you can do what you need to do, OP.