Round and Round I go

The job market is a tricky thing.  As graduate from my Masters program with a Masters in Public Health in Community Health/ Environmental and Occupational Health in May of 2009, I am still facing the same issues as I was before I started my program, I have no experience and no certifications.  So what am I suppose to do? I am constantly looking at wide range of job sites like: Monster.com, USAjobs.com, Career Builder, ESH Careers, Public Health Careers.com, Job.com, jobfox.com, Linkedin.com and STL jobs Today.com and submitting applications..... and silence because my phone or e-mail box is not getting a response. So where do I go from here? What am I doing wrong? Is there something on my resume that is not appealing? Am I going about applying for these jobs inncorrectly? Currently, since I do not have enough experience in my field, I am not qualified to take my Certified Industrial Hygienist (CIH) exam yet or my Certifie Safety Professional (CSP).  So I am stuck once again round and round I go like a dog chasing its tail. I have yet to catch it.