Some really good, sound advice here. My situation was similar - emotional abuse, disempowerment, made to feel too thick to be able to fight him and his threats. The thing that really helped me through was feeling f..... furious with him and what he'd done. He did turn things into a battle but I got angrier and stronger and he was scared of my solicitor!
My ex was a lawyer. Said he'd contest the divorce (he didn't and while most threaten it, according to my solicitor, few do). He made every threat you could think of but my solicitor saw through him immediately. Although he had squandered just about every asset we shared, the judge gave me his entire private pension on the basis that was all there was left.
Don't let his threats or bullying scare you. No matter how clever, strong etc you think he is, the law is the law and whoever represents you will have seen his sort many times. If you do feel unsafe at any time, contact the police. I did at one stage.
This is THE hardest and scariest time but it will be so worth it. I never thought I'd have the strength or intelligence to leave and manage on my own. Surprise, surprise - I'm doing just fine.
Wishing you strength to get through this - one day at a time - don't look too far ahead and grab as much paperwork as you can find. Bank statements, marriage/birth certs, passport, mortgage agreement etc, info re any savings or other assets You said you're dyslexic but don't know how much it affects you - are you able to gather these things together? If not, anyone who could help you?