Dusk it seems like you are being pulled into hundreds of mini-battles with different people, which must be draining.
Would it be possible instead to grab the bull by the horns and take a positive step to avoid this? I'm thinking something like a group meeting or email (including relevant senior people for backup) where you can raise the "issue" that you are having to spend lots of your time justifying the same decisions to different people, and suggest some alternative scenarios (which would work better for you!) - whether that's something like you sending a brief email to everyone summarizing reasons for a decision (to save multiple people coming to you about it separately), or them asking someone else instead, or whatever you think would work. It would need a bit of time spent on thinking it through and actually doing it, but could save a lot more time and hassle later.
It also strikes me that the people coming to you are expecting you to do a lot of listening to and empathising with them, but are not doing much of that with you. If that is the way they work, perhaps you could use this back at them - "I'm sure you will understand my position" sort of thing, mentioning your workload, how it makes you feel to have every decision questioned 6 times by different people, etc. Basically complain over the top of their complaining
Do you think that might work with them?
Lastly it seems as though you are waiting/hoping for someone to give you some strategy guidance from above, but they are not doing this. So again, rather than waiting for them to engage you, can you grab them? Ask for an hour with your boss to "ensure you are clear on the new strategy and objectives", note down lots of quotes to bounce back at your questioners, and get them aligned with your view - "So if I've understood it right, our/my strategy/priorities should be to do XYZ - would you agree with that?". And it IS actually OK to raise the issue with them and directly ask for backup too, if you feel that's needed.
I may be talking rubbish though
Got some work problems of my own atm (which I can't really share here though), so am definitely not an expert...