Abscessed tooth! I need low cost dental care ASAP?

Last year a filling fell out of my last back molar. Quite a bit of the tooth fell apart(and out of my mouth) soon after. I was saving to have it fixed, but I lost my job a few months ago. Now all my money goes to school and rent. I do not have any extra money. I also do not have any family or anyone, who could lend me funds in any way. I've been living on ramen for 6 months because I could swallow it and not cause tooth pain. When chewing became too much I switched to protein shakes. My tooth is now at the point I can suck through a straw and or drink much without immense pain. I do not have 8 hours to sit in a office and maybe have a chance of getting looked at. If I miss a certain number of days in class and lab, I lose grant money. I've missed my quota already just trying to get someone...anyone to look at my tooth. Nothing I'm in over $150,00 student loan debt, school comes first and I know it will be ok in the long run BUT...my tooth sure don't know that. :-/ I do not qualify for public-aid or medical help(trust me I have tried everything!) Please don't tell me to go to the Dental Clinics at UIC. I've been there and they require full payment upfront, no exceptions. I can make cash payments of about $20-$40 a week. No dentist or so called "free" clinic has been willing to work with me. I really scared for my health, I know the tooth is past abscessed. I just don't know what to do. Maybe I'm looking in the wrong places. Any advice would be very welcomed.
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There is a dental college about 20 miles away from me, and I know people go there for cheap dental care.
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