Hello All, desperately need some expat advice.

I moved to Zurich in April to work as a sub contractor in IT for a Swiss bank. When viewing the property that I am currently renting I mentioned that my employment contract had a 4 week notice and that under termination of my work contract, my tenancy would have to effectively follow the same notice period. The guy showing the flat, (not the owner) verbally agreed....

Well, it happened, the Client has terminated my employment and I am now out of contract. How can I terminate my tenancy agreement as I now have no income ?