Pop down in the bottom of the students union and ask them about their hardship loans and see what they can do for you, an extension to your overdraft is also possible as said above.
Probably see the Welfare Officer (if they still call them that) or the reception for welfare and I'm sure they can point you in the right direction.
Maybe show some willing by getting involved as there's so much going on such as Rag and dimprob (voluntary organisation). I used to do a lot with them and it's a fantastic experience.
Could you do some extra part time work? Always used to be loads going round Aber as I used to stay and work during the holidays rather than going home.
Places like Somerfield have all kinds of shifts and usually loads of hours and overtime going in the holidays, Burger King if it's still there, all the cafes and there's not shortage of pubs around the place. Even Safeways or McDonalds as you have a car. Loads of stuff that fits in with uni hours without having to work late shifts in a bar.
I never found it hard to get a job there and waitressed in the Grapevine, worked in the kitchens at Kings Hall and worked in Burger King and Somerfield throughout my time there.
Hope you are enjoying Aber, I had a fab time there doing law. It's a very special place and I made some fantastic friends for life there.