Neighbors can be so annoying! I live in an apartment and one of my neighbors have a little dog down stairs and everytime it comes outside, it starts barking non stop!
I also hate when kids play on the stairs, they make constant noises that gets on my freakin nerves!
Did you have upstairs neighbors before? It could be that your sensory issues aren't getting worse instead that you just now have more things triggering it.
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Autism is a disorder not a personality trait!
"God grant me the serenity to accept the things I cannot change,
Courage to change the things I can,
and Wisdom to know the difference."