Kate333,
Is there a student welfare officer/student liaison officer in your college/university? If so, I might suggest you have a word with them about your options. They may also be able to put you in touch with/refer you on to other services who can help.
It seems to me that if you are at risk of being evicted, you have no place else to go and are unable to provide for your own housing needs, then you are at risk of homelessness. You give us no indication of your age - so I am unclear as to whether you are over 18 years and legally considered an adult or not.
Either way, I might suggest calling into your nearest Citizen Infomration Centre for information on your options and the supports available. All advice is in absolute confidence and it's free of charge. They also offer free legal advice evenings for information on your legal situation.
It might also be worthwhile visiting your local Community Welfare Officer for free, confidental advice and information about help with paying the rent and other exceptional needs payments the HSE can make. They are available at your nearest health centre - their hours are normally displayed at the entrance.
I hope this has helped.