Holdmyhand, another latecomer to your thread, I'm so sorry you are going through this.
One thought that occurs to me- if he has lost his keys then your insurance company might require that you change the locks for security.
I would be tempted to get an locksmith in to change the locks tomorrow while H is at work, tell the locksmith that your H lost his keys and you are concerned they may have been stolen, and make a note of who you use. Then ring the insurance company, make a note of exactly who you speak to, which department and what time, and tell them that your husband has lost his keys, you have had the locks changed, and ask what other security measures you should take to comply with your house insurance policy. I would also write to them to confirm the action taken. I'd probably also email husband's work account to say that as he had lost his keys you have complied with the insurance requirements and had the locks changed as you are fearful for your security.
If your H then causes a breach of the peace by trying to get in, or tries to break in, call the police.
Please keep trying to get through to Women's Aid, you are in an abusive situation and they are there to help you.
Don't be bullied- I was going to say into leaving your house, but there's more to it than that. He's bullying you over everything. You can start divorce proceedings without his say-so; it might be a good argument for helping move things along more quickly.