Thanks for adding the caveat, 100% agree.
I should have noted I am not a medical doctor and this is only my personal experience after a very thorough assessment and diagnosis from a qualified and specialist ADHD doctor.
As far as I know methylphenidate is not indicated or licensed for the treatment of misophonia, nor is it available to buy over the counter. In the UK it is a controlled drug so possession without a doctor’s prescription is against the law. Like all medicines it comes with a long list of contraindications and side effects.
That being said, subject to all these same caveats, I am happy to answer any questions if helpful to anyone.