Also, make a plan if you have the time. make copies of every financial record you can find, tax returns etc, pay stubs if he has any. there are lawyers who will do a free initial consultation and give you some advice in how to proceed with a divorce, esp so you can get child and spousal support. those are important!
but if you need to get out right now, go to those places that were mentioned above and remember this...things can be replaced...you and your children cannot. I will note, the one thing my gf regrets is not getting her family pictures. everything else she left behind and had no regrets, and this after a 30 year marriage. stuff is just stuff. please be safe!