Cancel the cable and the internet connection. There's about $100 a month already. Shop at the dollar store. Some items are exactly the same but guess what? They're only $1. Call the credit card companies and make arrangements with them. When you do have to shop, shop at the warehouse store. Get books from the library rather than buying them. Sell items you no longer need on e-bay (with someone else's internet connection.) Maybe rent a room rather than an apartment to lower the monthly cost there.
Good luck to you.
Or-here's a thought. You're a student, right? When I was in college you could dial-up free into their network for free internet. Perhaps you could do that and still have internet. Most schools do something like that IIRC.