That was too many details for me to absorb or even read. If you had separated the walls of text into specific issues, I could have understood what all the main points were. However, I get the impression it woudl be best if you could set some limits with this person, which might require learning some assertiveness skills. Some useful phrases:
Please lower your voice.
I don't want to go into it.
I'd rather not say.
That's personal.
I see it differently.
Etc.
This person is dumping and raging all over you. You're working hard, and you don't need this person's crap!
I'm not sure if the boarder is the same person as the co-worker, but in your home you are the boss and the boarder should toe the line!