@BlueCalibur,
Mould is as Punkey stated, extremely toxic, dangerous can cause all sorts of illnesses.
I am a Property Manager amongst other things. Recently, we had to combat mould for a tenant, unfortunately it involved replacing the whole roof, part of the ceiling at a cost of $5k to the landlord. This would be why your landlord probably doesn't want to broach the subject. More than likely the entire home needs a new roof, down pipes for the water to go away from the house.
Mould is "toxic" I want you to hear that word. I agree, no matter how you do it, it's time to move house.
In the meantime, warm water and vinegar, do not use bleach as that only whitens the area and is also toxic breathed in. Then another bucket of warm water to wipe over after.
Leave the second door closed for now don't attempt anything in that r0om.