Oh sis! You poor beautiful beautiful creature!
So sorry you're body and mind are ganging up against you, but YAY for quitting the smokes! (says the hypocrite

)
I think you should let your pdoc know that sleep isn't happening, like you said, its required for you to be able to function, and function you are required to do.
You'll beat this thing, you're a Warrior Princess remember? One that has conquered every battle before, and one that will beat the shyt out of this one too. You're just way too amazing not to.
Remember to set aside time just for you. Even an hour, to take care of you, be NICE to YOU. You're worth every damn ounce of effort!
I'm here, and on fb, and listening if you want my kinda ears
Love you bunches and keeping you in prayer.