I am so sorry you are faced with all of these sources of stress...all of these can wreck your abilirty to function, and I speak from personal experience when I say this. What has helped for myself and a few other people in regards to the noise is simply to get out of the house as much as possible. Bring your work to a quiet study area in the library...that way you can focus, relax, and get everything done without having to worry about the noise level.
As for the landlord dropping by unexpectantly, it has also caused problems for myself as I hate being interruped and having to answer questions at times when I am not in the mood. It is incredibly stressful and I can easily understand your frustration there. It's something you unfortunately have to deal with though, and if I had a way around it, I would totally share it with you. In my case, I just answered his questions, no matter how stressed I was, but often it just made me more stressed because I had to deal with unexpected interaction. 
_________________
Given a “tentative” diagnosis as a child as I needed services at school for what was later correctly discovered to be a major anxiety disorder.
This misdiagnosis caused me significant stress, which lessened upon finding out the truth about myself from my current and past long-term therapists - that I am an anxious and highly sensitive person but do not have an autism spectrum disorder.
My diagnoses - social anxiety disorder and obsessive-compulsive disorder.
I’m no longer involved with the ASD world.
Last edited by anneurysm on 05 Oct 2011, 12:22 pm, edited 1 time in total.