I am one week in to new job as a grossing tech, I know the job is not for me. When can I quit without being blacklisted by the hospital?

Hi, I am too paranoid to be working this job. Everyday, I have a headache and an itchy throat and nose, indicating formaldehyde exposure. I am miserable literally all day and cannot sleep at night thinking about this. I do not like my job enough (or at all) to be sacrificing my future health and fertitlity like this. The fumes are so strong that I can literally taste the chemicals in my lab, and everyone’s attitude is that they’re going to die of something, why not it be cancer. I do not want to be here for another two weeks, the chemical exposure scares me. The job is also completely different than the description that enticed me and made me want to join and the hours are not working for me, I don’t sleep pretty much at all. I started working at my hospital about a week ago, when can I quit without getting blacklisted by this hospital? I maybe want to be a doctor and this is a respected hospital in my area.