Loulou40, you're sure to get a lot of sympathy and good suggestions here, but it's hard to offer specific advice without knowing your circumstances better.
Let me add a Christian perspective that I believe applies to everyone. We all go through troubles in this life, but our struggles with them serve a purpose in God's eyes by testing and shaping our character. You see, we were created for a purpose in life: to know and love God and to learn how to love and care for others. Most of our problems steer us towards or away from this purpose.
While others suggest good things for you to do in order to improve your life, I suggest that you also turn to God for help - in changing you into the stronger, better person he wants you to be. To that end, here's an exceptional song I'd like to share.
If you like it and want more help or encouragement like this, let me know.