I was going to suggest the same as hellywelly, speak to your GP surgery and see if they can arrange for him to be seen by a GP (maybe a general health check up which could account for a longer appointment, review any medication etc...) who can hopefully try and engineer the conversation to see if he is receptive.
I imagine it's maybe an easier question to ask at the moment, about mental health and how people are coping generally, given the pandemic as so many people have been.
Do you think he'd consider going to any kind of therapy together, if he wants to continue the marriage, as you have been affected so much. Or do you think that could make things worse, going together and talking about the issues? Could something like Relate be an option if he won't consider speaking to a GP?
https://www.relate.org.uk/
Even if he doesn't, some kind of therapy may well benefit you, give you a safe space and an outlet to be able to talk about things. Maybe, if he sees it's helping you it might make him consider it. There is often a wait for NHS therapy but could you afford to pay privately? GPs often have details of recommended private counsellors.
Also, if he's mentally abusive, there are charities you could speak to, there doesn't have to be physical violence.
https://www.nationaldahelpline.org.uk/