Sorry to hear you're having to deal with all this.
You did absolutely great on not talking the divorce with your daughter.
"He told me....you'll cash in on 600k for an insurance policy that will have you two set....they'll find my body in a ditch somewhere.
Does it really get this out of control and crazy?"
I know with my xH it did get really bizarre and crazy which was to me really surprising as xH is not a bad person. However, it did get really silly with him telling me I was out to ruin his career, I'd be responsible for him drinking his life into oblivion etc etc. Our divorce will be final next month, but he's already started a new business, is involved with organzing an international conference and is looking forward to a rosy future with OW, or rather his GF.
He consistently told me I was crazy, I was out of my mind etc etc. I began to believe I was crazy and saw a counsellor for almost a year before I believed I was not demented.
What helped me was to separate my life (we lived in the same house for almost two years after separating so this was really really tough) from his; and to keep our interactions focused on practicalities rather than emotion. Any time conversations veered into emotions, I'd say 'however, that's not the focus. let's deal with this 'issue'.