I'd steer well clear of anything medical on YouTube. Even doctors with strings of qualifications are putting out all sorts of unfounded theories and rubbish. And as others have said, anyone can call themselves a therapist.
I'd also steer clear of the neuroplasticity and mind/body stuff you find online. It's not based on research, it's all anecdotes, and making some people a lot of money. Their victims get sucked in and end up blaming themselves when they don't get better, or if they do happen to be on an improving trajectory anyway, and happen to try one of these training/therapy/snake oil things at the time, they realise it's a great money spinner, and set themselves up in businesses with all sorts of 'feel good' names to entice people in.
I'd also steer clear of the neuroplasticity and mind/body stuff you find online. It's not based on research, it's all anecdotes, and making some people a lot of money. Their victims get sucked in and end up blaming themselves when they don't get better, or if they do happen to be on an improving trajectory anyway, and happen to try one of these training/therapy/snake oil things at the time, they realise it's a great money spinner, and set themselves up in businesses with all sorts of 'feel good' names to entice people in.