Millet, spilling the tea:

I have this terrible thing, that I've had since a kid: I can't handle layers noise.

My hearing is actually very, very good. I can hear things most others can't hear/from far distances.
But it's utterly useless if there is another noise and then I can't hear anything even right next to me.

If I am having a conversation with someone, and like- a radio is playing.
I have to turn off the radio. Seems fine but it becomes a social problem during things, such as
Dungeons and Dragons. Teammates like to play with battle music playing. But I need it to be
so low that they claim they can barely hear it. Whereas I hear it and it sounds clear to me.
But when the radio plays at their preferred volume. I can't hear anything the DM is saying or
the players and I have to ask them to speak up a lot and they get annoyed. (not terribly annoyed- we are friends. but ya.)

It becomes a bigger issue if there is things such as a family gathering.
I'm not used to family gatherings, everyone in my family just kinda hates eachother and does their own
thing with minimal contact. But my fiance's family is jovial, super involved and has regular gatherings.
I don't mind that there's people around (I mean, I prefer my alone time but I'm not falling apart over human interaction now and then.)
but I do mind that there is so much noise..

The more layers of sounds start to physically jostle me and I cannot control it..

Dogs Barking.
kids screaming begging for a toy.
Fiance's father has a very deep but very loud voice and tends to yell a lot over everything.
(everyone kinda just accepts he has anger problems and yells angrily for no reason and treats it like a cartoon thing.)
My fiance has a very loud laugh and is always competing for higher volume over his dad.
Then the 2 uncles and 2 aunts who are having two conversations at once and trying to reel me in (to be courteous.
they all go out of their way to make me feel like family.)

The oven is buzzing
the microwave is humming
The ceiling fan is buffeting
doors being frequently closed and open.
sounds of steps up and down the stairs.
ringtones going off.

I get paralyzed. I freeze up. There isn't a headache but just a genuine over stimulation.
I get so friggin tense that if someone being kind touches my shoulder without my knowing I
jump like they stabbed me and it looks over dramatic and I feel super embarassed.
I feel like I kill the mood a lot. I did try explaining this issue to them and thoroughly expressed
"It's a me thing- I'm not saying you're doing anything wrong." so I try to escape but hmm..

They vy for me to come back and then I feel rude/guilty. But if I go back I get too overstimulated.
If I go away and try to come back in spurts I do a bit better but the minute I go away they all want me back.
"It's ok we accept you like this" is nice of them to say but they dont' seem to get that I don't like feeling like this.
Im not trying to hide myself in shame, I'm getting away from the thing that is causing my body to burn up in pain.
It's literally that bad, too much noise, and my body hurts. My head gets severely hazey/foggy. I can't focus on anything.
It's just a giant room of noise that is crippling. I've tried to explain that elelment but they just don't get it. (My fiance does, and
He has tried to explain too that I'm not taking frequent breaks to walk outside just to hide. but they don't get it xD "Well why
do her ears hurt does she need a ENT?" /myears don'thurt)

Anyone else relate at all? I know I can't be the only one with this issue. lol
This was like my entire day yesterday and it really left me feeling weakened the whole night
and even into today.... :/

You wrote a really long intense post but all I can say is: same. I am this exact way. Noise in general gets on my nerves but multiple noises = no way!!! I put in ear phones to muffle the noise kinda and its works. I am generally terrible in social situations and my intolerance to noise is not the worst thing about me but I definitely feel what you're saying. It's exhausting :/