I have always had a hard time standing up for myself as well.
It sounds like your living arrangement stinks for your needs!
How frustrating!
I am glad you are trying the ear plugs. Have you tried a white noise machine? Sometimes they are on cheap alarm clocks, and you can just use it to play nature sounds or white noise and it covers up a bit of the chaos. Or the sound of a fan is something I personally like to drown out other people.
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Admitedly, I only made it one year in the dorm and then I got a studio apartment. I was so exhausted from the courses and socialization that I was able to sleep, but I slept alot during the day when no one was around too.
Have you ever tried a weighted blanket? While it doesnt provide a remedy for the sound specifically, the comfort a weighted blanket can provide could help you in regards to not having a meltdown and relaxing. I am making one for myself and it makes me feel quite comfortable, like Pooh bear in a cave full of honey.
Just my two cents! Hope your situation improves!
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Your Aspie score: 165 of 200
Your neurotypical (non-autistic) score: 48 of 200
EQ 12 SQ 70 = Extreme Systemizer