Hi Anonymous, I’m so sorry to hear what you’ve been going through.
Try, if you can, to explain to your mum that the most cutting edge research from neuroscientists suggests that misophonia is a neurological disorder. As such is something that happens in the pre-conscious and is to something you can control having a response to.
It’s great that you’re seeing a therapist to help but please please don’t go down the exposure therapy route. Exposure therapy is a completely and utterly unproven treatment for misophonia (despite certain practitioners with a financial interest suggesting otherwise). It may do more harm than good, not to mention the expense.
You’re not trying to overcome an irrational fear of spiders – as suggested it’s most likely a neurological condition (see Dr Sukhbinder Kumar’s study). You can’t cure dyslexia with exposure therapy and the same applies to us.
Wishing you all the best with everything, I promise you it gets easier as you learn different coping mechanisms. For now, why not point your mum towards some of the latest misophonia studies? You can find links to a bunch on this site.