OP I’m so sorry you are going through this. I’m raging at him for you.
Its infuriating at the best of times when men don’t apply their skills, intellect and abilities to what they no doubt view as menial tasks that don’t require full attention (internalised misogyny as it’s always been viewed as women’s work).
But pragmatism needs to be front and centre here. The anger will just make you feel worse.
May be write him a letter asking him for what you need - be really clear that this is one of the scariest times in your life and how he handles this will define your future relationship and how you see him. Sandwich it between thanking him and praising him for what you can.
Then sit in it for a bit and then decide whether or not to send it.
But once it’s written try and breathe the anger out. Let go of the things you can’t control. Do what you can to make yourself more comfortable.
Come here and have a really good moan about that idiot man!!
And yes he will underestimate and invalidate your experience and you will need to make the call if you need an ambulance. Again - internalised misogyny.
Is there a good friend you could ask for help? Someone to cook you the odd meal. Be on standby to call an ambulance if you think you need it?
Also might be helpful to talk to others who have been through Chemo. I bet you are not the first woman to feel this way about her useless lump of a husband.