Sure looks like you're "there." For those of us in the U.S. in this age range especially, health care costs are the monkey wrench, but given that it looks like you could, in theory, live on mostly just the SS alone (at age 70), in a way, you really only need to make it 15 years on that giant stash. Shouldn't be a problem, I wouldn't think.
Out of curiosity, have you checked out what your ACA payments would be at the 68k income level? Personally, I'd want a ballpark estimate. It seems ACA options are stronger/better in some states (?), so maybe also have that info in your toolkit, as an option (to move if necessary).
You'll be eligible for Medicare in another 10 years as well, so even if health ins costs increase significantly, that's only temporary.
Lastly, as someone roughly the same age as you who was previously healthy her entire life, clobbered with sudden chronic illness a few years ago (and that greatly diminishes my energy level and ability to do all the things I want to do...), I say: Life is short. You've worked hard to get to where you are now. Go do whatever you two want to do every day and enjoy! You did the work to get here. Congrats!