DH has been a bit digging his heeels in lately
I'm interested in this comment. It seems to imply that in the past you have mainly got your own way and recently he has not been a pushover.
In your original post you said a night of passion wasn't on the cards 'because he'd pissed me off'. And while I do agree that you have bodily autonomy you do seem to imply in your posts that sex only seems to be available when he is doing what you want and it's almost a reward for being a good boy who does what he's told. Which is really unhealthy. The way you word it doesn't make it sound like it was because you didn't feel like it but a conscious punishment. He dealt with it badly, but if it's genuinely not a punishment or means of coercion you need to communicate that better because the clear message that I and he got from what you said is 'No sex unless I get my own way'.
You clearly have very different ideas of what constitutes a good holiday. You seem to want to go somewhere cool and do activities, he wants to go somewhere hot and relax. So, yes, alternate years sounds perfectly fair. You did what you wanted last year. Did you fork out for an extra sunshine holiday for him? Did he sulk and moan it was too cold and the food wasn't exotic enough and he wanted to relax instead of doing day trips or activities and try to leave early? Probably not, he probably did what most people do and tried to make the best of it so he didn't spoil everybody else's holiday. A week in Brussels sounds dire and really it's his turn this year, so either go and make the best of it or stay home.
I have to say I've seen quite a few posts on here recently where husband's have been sulking and moaning about holidays and the general response seems to be 'leave the miserable git at home' so I'm a bit surprised that you're being told YANBU well I'm not really cos MN is often hypocritical about standards between men and women.
Lastly, my DH is vegetarian and this has been an area of conflict between us. I have literally had to walk round Paris for four hours in snow and minus temperatures before he could find somewhere he was satisfied to eat. We were hugely restricted on where we could go on holiday and eating out wasn't an option. It was frustrating and unfair that his diet choice impacted so much on the rest of the family while he didn't make much of an effort to minimise that impact. For example we can't possibly go all inclusive or eat out incase there isn't anything to eat but guess who cooks when we go self catering?
We've worked this out by going SC but sharing the cooking, and eating out sometimes even if he can just have chips or a cheese pizza or cheese stuffed peppers. He also has to make the effort before we go to learn enough of the relevant bits of local language to ask about things like cooking oils and I expect him to research things like if local cheeses use synthetic rennet (which is generally unlikely). On the odd night, for example if we want to try a fish restaurant, he stays home. If he has to have a fortnight eating variations of bread, potatoes, egg and tomato he makes the best of it because he understands it's not really fair to deny his children new experiences because of his preferences. You seem perfectly happy to sulk about not being able to eat the food, but you seem perfectly happy to stop block them from eating too and have to walk past all the lovely restaurants serving beautiful food because you won't go there.
You don't seem at all open to compromise or putting up with other people's preferences. It's all about you, no hot weather, relaxing is too boring, you want to go somewhere with a wide availability of restaurant vegetarian food rather than working around it. You had all that last year, this year it's fair he has his kind of holiday. YABU.