Glad you made it through the night, Punk. And, until you can make the necessary alteration to your current mindset, that's how you have to do it; one day and one night at a time.
Whatever way you look at it, he's not the man you thought he was and you know from these boards that this is not an uncommon state of affairs.
Please read and re-read Charbon's post and start externalising your anger. Rant, rage, wail, and shake your fist at the sky but don't beat yourself up for his failings, or let yourself feel that you've been all kinds of fool for placing your unequestioning trust in him because endless blame and recrimination will destroy the essence of all you have strived to be, and all that you can be.
Any debilitating long term illness takes it's toll but, even though you've been dealt a very cruel hand healthwise, you have much to be grateful for. Read about the tragically short life of Nicola Dryburgh, a writer like yourself who never knew the joy of marriage or bearing, birthing, and raising a child and draw inspiration from those who haven't gone gentle into that good night.
The pressures of running a home and coping with teenage angst are subjects that you can wax lyrical about on these boards and, whenever you're in need, you can share the load in the knowledge that you'll never be short of sound advice.
Teenagers can be utter pitas but, by god, they're amazing! Revel in your teenager, relive your youth, embrace her enthusiasms and counter her negativity with positivity. Your dd might not appear to be listening but you can bet it's all going in and one day she'll draw on the bank of information that you've imparted to her - and that'll be the day she wonders whether she's turned into her mum!
Many of us have times when we're weary and teary; when it's all too much to bear and we just want an end to the misery. Those are the times when we need to be especially kind to ourselves. Times when we need to halt the endless whirlwind of vivid memory and imagination so that we can centre ourselves in the present, in the 'now'; in the eternal 'now' that exists at the centre of our being.
Be kind to yourself Punk, and take time to marvel at the wonders that surround you, be they nature's raindrops forming random patterns on your windows or the objects that have come into being through the infinite creativity of humankind. You are part of the miracle of life, honey, and life is too precious to take it for granted or throw it away.