Quick diagnosis - is that possible?

This could have been asked before, I'm getting really frustrated with myself as I know I must have ADHD and this is probably why I can't seem to cope with the thought or the waiting times that seem to exist to get diagnosed. Would anyone know of any good service that is fairly quick? I don't mind if it's online or in person, I'm in Dublin Northside but can travel.

Once it was suggested to me last year that I have ADHD my world changed for the better as I understand now why I am certain ways, but recently feel the urge to know for sure.

Thanks for any help you may be able to give 😊