Grima?!

Do you wince when you hear sounds like scratching on a chalkboard or high-pitched noises? Well, I do and it's not very pleasant.
I realized that I was sensitive to few sounds when I was around 12 - 13 years old. Particular noises such as chewing or when my friends accidentally scratch their school bags with their nails (a bit specific but this happens a lot in school) causes a headache.  
Also whenever my family travels in a car, my mom grabs the car 'grab handle'... and EVERY SINGLE TIME, she scratches the handle with her nails. The sound hurts my head like anything and the rest of my family do not believe that it causes pain.
A couple of months ago, my sister was furious with me for some silly reason, and knowing that I usually complain about the scratching, she started dragging her nails across the car handle. I tried to ignore her in order to stop infuriating her, but my 'sweet' sister kept scratching and scratching... (she did it for about 5 minutes but it felt like forever )until I felt my head kind of exploding and she only stopped when she noticed tears welling up in my eyes. The funny thing is she still doesn't believe it hurts me. Just writing about it makes my head ache slightly. 

After this incident,  I did some research (read: browsing through the internet) on what I was experiencing. 
Majority of the people find noises such as chewing, slurping a bit bothersome but there are people who show negative emotional reactions like annoyance, rage, and become overwhelmed. The particular emotion that people might experience is termed as 'GRIMA' in Spanish.  This can also be called misophonia. Physically, hearing a sound that triggers misophonia typically causes a feeling of ‘pressure’ in the chest, arms, head, or even the whole body, perhaps because of tense or clenched muscles. It can also cause you to get a bit more sweaty. Hearing selective sounds makes my heart race and sometimes gives me a slight headache.
This can be experienced in a severe manner by people who have obsessive-compulsive disorder (OCD), anxiety, depression, PTSD. It can also happen without any trauma too.
One possibility is that misophonia is a type of synaesthesia, a harmless neurological condition in which the senses get tangled up with each other or with other aspects of thought, so that numbers have colours, words have tastes, or music has texture. In the case of misophonia, it seems feasible that sounds could have become tangled up with emotions.
Currently, there is no proper treatment for misophonia, but you could reach out to a psychologist in case you suffer from extreme misophonia. I try my best to avoid such sounds and thankfully I do not experience this at an extreme level in order to affect my daily life, but the fact that people think  I'm exaggerating makes me sad. Awareness can make a good change and knowing what sounds you are sensitive to can help you to avoid them. Especially in smaller children, so that it is not mistaken for emotional outbursts. There are also misophonia support groups and talking to others might help.
Please share your thoughts and experiences about Grima!