Hi can anyone help me on this one?
I'm married to a tunisian man but things are not working out as planned?
Can I leagally divorce him? Would I still be liable for his debts or upkeep
Will he be allowed to stay in the country if he is still on visa alowance?

You need some more background information here. Are you both in the United States? Is he on a visa now? If you are legally married to this man, then you should be able to become legally divorced. Did he come to the U.S. to marry you? Or was he already here?

The questions you ask, you can easily ask a representative of the U.S. Citizen and Immigration Services (formerly known as INS). The folliowing is their website:

USCIS Home Page

Toll free number is:

National Customer Service Center (NCSC) at 1-800-375-5283 (TTY 1-800-767-1833). This toll-free call center has additional information and, during their specified office hours, can connect you to live assistance in English and Spanish. The NCSC will be able to answer most questions - although they cannot provide information about the status of your case over the telephone.