Go meet with in attorney today. Most attorneys will give you a free or discounted consultation and if you call enough of them, you will be able to get in somewhere this afternoon. You need to find someone who will file an Emergency Ex Parte Application for Temporary Restraining Order tomorrow.
Keep calling. Most lawyers should be open today. Leave messages.
This answer DOES NOT establish an attorney-client relationship. This answer is based on the limited information provided and is not intended to be conclusive advice. There are likely other factors that might influence or change the advice after a more lengthy consultation.
You cannot withhold without a court order or you could face charges of contempt. This would require you to file either a protective order or a temporary restraining order and attach an affidavit explaining all the abuse and drunken episodes. You can also file a report with CPS to have them look into the situation in Colorado.
Sign up to receive a 5-part series of useful information and advice about child custody law.