I assume you are in the UK now. Do you have a date that you must return? Can you do any business with Massachusetts while overseas? It is cold here to be living in a car. How do you know bf will return the car to you? You risk DCF removing your child. They could place him back with an abuser. The bottom line is the safety and welfare of the child. Think in those terms

I am sure your thoughts are jumbled in your head right now. Stop and organize them from immediate needs to long term needs. Ask supportive family to help. Write them down to help you clarify the needs of your child and you, also. Don't get ahead of yourself with what-ifs. Just be concrete and look at needs for survival.

Act like an ant and take small steps to achieve your goals. Hang in there. You can do it if you prioritize to your son's needs and get factual information.