I'm afraid you are going to need to get smart and organized. Hard as it is, running away to a hotel is not the best way of getting yourself to a point where you can leave your bully of a husband.
In the first instance, contact your perinatal MH team and your midwife. I have no idea whether they can direct you to practical help, but hopefully they can at least help you with your MH and your pregnancy.
Secondly, once you are back in the marital home, can you access your husband's financial records? Scan or photograph as much as you can - bank and investment statements, P60s, tax returns, mortgage, pensions etc.
Third is education about the divorce process: Divorce for Dummies, Wikivorce, websites of family solicitors. The more you know, the better prepared you'll be.
Then see an experienced family solicitor and explore your options. Sadly, you may have to accept that you will probably end up in a rental somewhere, and your children may have to change schools. But your MH overrides other factors, and your children will be emotionally better off once they are away from the current toxic and abusive environment.