What to do if i've got also used a rusty blade can i get hepatitis or any other blood infection?

Depends: Did anyone else ever use that razor blade? If so, you are putting yourself at risk for transmission of bloodborne infections such as hepatitis b, hepatitis c, and hiv. Even if you were the only one to ever use it, i would discourage you from shaving with a rusty razor blade as you can contract other bacterial infections including tetanus. Get a new razor!