'off of' or 'off'?

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Texting a friend about being on holiday. Should it be 'off work', 'off of work' or 'off from work' and why is it whichever one it is? First feels unfinished but others don't sound quite right.

I know I could just use 'on holiday' but enquiring minds need to know!

I don'tt like number 2 at all. 1 and 3 both sound fine to me, but I'm no expert!

Off! Off of is horrible.

off of doesn't even make sense!

i am off work is fine
or i am holiday
or i am off at the moment

I agree but why?
What's the grammatical rule or rules that I'm breaking/applying?

In this situation I would put 'not in work' haha

I'd say off work. I don't like off of, DP says things like 'I'll take that off of the table' which to me sounds all wrong. I think it should either be off the table or take that from the table.

Technically, there's nothing grammatically wrong with "off of".

The problem with it is that:
a) it's never morphed into one word, unlike its mate "onto"
b) it sounds clumsy, unlike "onto"
c) people use it in two different ways, only one of which was ever correct
d) it's not used that much in UK English, but it is in US English.

I change it when I see it in students' writing. Not always because it's used incorrectly, but generally, because there's always a nicer less clumpy sounding way to say the same thing.

In the OP, "off of" would be wrong.

Hey, you! get off of my cloud!

In order to be 'off' something, one must first have been 'on' it. Therefore none are correct. The terminology is "I am currently absent from work" or "I am taking leave, at the moment". That said, I think common usage and historical usage would suggest it was dialectical and not grammatically incorrect.
motivatedgrammar.wordpress.com/2012/07/31/on-off-of/