I’m so, so sorry
The fear of an explosive child is truly difficult. We now believe our youngest daughter may have fetal alcohol syndrome. In a drastic oversimplification- my complex little girl has no empathy, is very manipulative, and very angry (about everything). She’s also very smart, creative, and funny. We love her and continue working with her daily… but it’s hard. We’ve got 6 kids & all have their own unique needs, but her emotions take the most time and energy… from
all of us (not to mention that she also has substantial physical, medical needs to add to it!).
So, yes, I get it… and it’s a big reason why we don’t
usually all travel together. We kinda take turns. It’s best for everyone. We’ve found our groove, and it works for us. We still have whole family trips & times to make those memories TOGETHER, but it’s not our norm, and that’s ok.
My hubby isn’t huge into Disney (like me), but enjoys going with me. He does, however, love the
DVC resorts.

At first he thought he wouldn’t want to take any kids to WDW himself (without me), but he changed his mind & has enjoyed an all boys trip and 1 with just our older daughters. He
loved those trips!! But I think part of the reason for that is that the kids were always excited to go with him (even though some may want a vacay somewhere else, they all still love Disney- even as young adults).
So, in your case… if your son wouldn’t want to go, would it make your DH have less fun too?? In my house, daddy is the fun one- yet, when we talk Disney all the kids love going with me bc I
LOVE it and that energy is contagious (that’s what they say anyway

)!! The same is true for party-poopers though

… So, I’d have quick a heart-to-heart with DH & DS, and see what they really want.

You’re sweet to be ready to give up your vacation time- and it might be the right call… I have no idea. On the other hand, if you’re the Disney glue & they would have more fun if you’re all there together, think about how that could work. More pool time with just you & DD was my first thought (like the PP suggested)!
For our daughter, the closer we keep her to “normal” life while on vacation, the better. So, if we nap at home- we nap at Disney. If bedtime is 8, so be it. If we wouldn’t eat dessert every night at home, we’re not loading her up with sugar on a trip. Being overtired, or having a sugar crash, can make ANYone less pleasant… but if they’re a already a little powder keg… it’s like throwing on some kerosene before striking a match. Our other 5 kids, however, can truly
enjoy all the “specialness” of a trip to Disney, bc they handle everything so very differently. I’m sure you’ll figure out what works for you & both your kids.
Stress that overshadows vacations is hard. It’s totally understandable that you’re having cold feet right now. Just talk it out with your family. I’m sure you’ll be able to find a solution everyone can be ok with (we’re not looking for perfect here

)
Sorry this got so long… I wish you the absolute best!
… @jppeek just posted & I'm so thankful for their perspective! We have no idea the context for what is making your little one struggle so much right now… and that makes a big difference! But you asked for thoughts on “severe behavior problems during travel” …and these are mine.
But it also makes me think that we had years of “experiments” before we figured out the best system for us. I wouldn’t let fear stop you from trying an experiment… it might go better than you think! (Fingers crossed!!) And if not- it will be something to learn from in order to make the next trip better