My DS is 13. So he won’t get over it that fast.
And I booked it without “permission” from my husband because I have my own money and he has his and as a 47 year old I don’t need permission to do what I want.
I'm not sure why you're putting quotes around "permission", as I didn't see anyone indicate you needed permission. I just saw surprise that you're considering purposely waiting later and later to let your husband know you'll be gone. Saying their own husband would "flip out" doesn't mean they need "permission" either, just that their spouse wouldn't be happy, which I understand, because I wouldn't be happy if my spouse opted for a solo trip without discussing it with me first.
You're asking how we deal with fits and tears, and the first way my spouse and I deal with such things is to discuss any plans with one another ahead of time.
We find it's much easier for two parents to work out a plan to reduce the upset of the kid(s) if they are both in on the plan together from the get-go.
That way the spouse staying home has time to be sure that they know all of the ins and outs of the kid's routine (There are some things I do every day with my kids that DH might not be aware of and things he does every day that I'm not totally aware of.) and to maybe schedule time to do something special with them while the other parent is gone away, etc.
We also find it easier to work together in regards to the kids if we aren't unhappy with one another, and in our house if one of us planned a solo trip on the sly, booked it on the sly, and then purposely waited additional time to tell the other, the other would definitely be unhappy. It's not about whose money pays for it or anyone needing permission. It's that we're a team and we work best when we're discussing bigger plans ahead of time, and we personally consider someone leaving for 5 days a bigger plan, as it requires rescheduling of the day of the parent staying behind.