We don't normally use halved adjectivally - it's far more common as the past participle of the verb to halve = to reduce something to half of what it was OR to divide something into two halves.
There are a few contexts where it's used as an adjective - for example...
...but in general it's probably better to just use half (with or without the optional ...
Having faced with unemployment does not make sense, syntactically or in meaning. You might be able to interpret "having faced" as a baroque construction for "having faced off" meaning "having confronted" but that would imply two people facing each other; one cannot face off with unemployment (an abstract noun).
Being faced with ...
I hadn't known that
I didn't know that
The ignorance that you were supposed to work from home happened first.
The realisation when your senior told you that happened next.
You should use 1).
I hadn't known that I was supposed to work from home until my senior told me.
You are correct - Stopped is an adjective in He is stopped, but a verb in He has stopped. It is defined as a verb or an adjective in here: https://en.wiktionary.org/wiki/stopped
Both are grammatically correct, and I think can be applied fairly interchangably, depending on the context and the point you want to get across.