Harassment, child support, false accusations

I'm being falsely accused of harrassing and stalking from my ex-boyfriend and father of my son over the internet. I have written documents and statements that I could not possibly have been there or done that. He's been trying to get out of child support and is certain to use violence. This harassement started after the Mass court issued a restraining order against him for threatened violence. Enfield police called and said they have an arrest warrent and they want $5,000 bail or they want me to sit in jail and find a baby sitter for my baby who, at this time, is only 6 weeks old. any help or information would be greatly appreciated. I am presently unemployed and money is very hard to come by. Thank you.