If child is for previous marriage?

Hi there.
We are 5 years together. 2 of them married. On monday he tald me to leave house by Saturday or he will pack my things and put them in garage. I am a foreigner. I have 13 years son. I ve just started doing my degree in college. Have no income at all. My son is from previous marriage.
I am scared to death - because I dont know where I will go and specially about my son losing his friends, his room, it will be to much changings for him as we will need to leave the country. House is on his name even he bought it for us when we decided to marry.
All finanses under his control and he trnsfers for me monthly 400£ for my and my son expenses.I ve contributed a lot to this house -not financially - but redecorated it threw out and was good houswife, doing everything myself, never had a luxury of windows cleaners or maid which could do according to his income.
I am in complete darkness.
if somebody knows anything related to divorde with foreigner and child not being his - HELP.
Any advice will be appriciated.
Anya

Thanks for replying to me, Fiona. I am staing near PC for the last 3 days.,
your message helped a Lot.
Regards
Anya