Yes you can Natty. You are an incredibly positive person. You are having a shit hand dealt at the moment. But you will get through it.
I think you need to get onto your bank and get that £700 sorted, and have them amend your credit record.
Who do you bank with? Try saynoto0870.com to get their head office direct number, then speak to someone in customer care. they allowed someone to rip you off, so they should be responsible.
CAB will help you. Call them and make an appointment.
Once you start the ball rolling, things will seem more positive. I promise.
And if you don't do it now, because you need to lie down and cry, promise yourself you will do it first thing tomorrow, and take back the control.
don't let the fuckers get you down.