One week on

So today it has been a week since I resigned, and I have still not found a new job. Its getting very stressful now, and I am not sure what to do. I need to get a job right now because I have bills to pay, however, the only thing I find myself applying for is for sales jobs again. The problem is however much I hate it, I need to do something while I study to get into the Ad industry. I could just not be at my previous job for much longer. So now I am just applying for anything, and when I hear the job, my stomach turns again because I know I am going to be in the same situation of hating what I am doing and be there for who knows how long. I feel like sitting in a corner and just fading away. The end of the month is drawing near and I am still a sales rep. Other than sales, I don't know what to do. I have to work to pay for studying. Its all a little crap right now.