All but one of the woman I know who are SAHMs married to men earning that sort of wage, do use some sort of childcare anyway, a part time nanny, a couple of mornings at nursery, basically to keep themselves 'sane'. And because all the family work falls to the wife, so they are buying the time. (and the one I know who doesn't use childcare of any sort for her 'too young for pre-school' DC does have a full time housekeeper/maid)
Sit him down, explain your career matters to you and you accept he's enabled you to focus on an interesting career rather than a profitable one, but you care about it, and still want to continue. Point out it's only until your DC is 3, that you'd be with them all day before they started pre-school, or 2.5 if you will be using prep school pre-school - so assuming your DC is coming up to 1 when you go back to work, it's 2 years max, possibly only 18 months before they would be off to preschool anyway and you'd be talking about part time wrap around care rather than part time nanny.
For the sake of 18 months, he wants you to give up a career you love that you feel keeps you 'you'. That's hardly fair.
Talk round other help you can buy in to make the next 18 months easier, cleaners, gardeners, private part time PA for the family, and possibly even arranging a half day more childcare than you need to give you time, staggering/planning holidays.