Once you get your CCNA, you will definitely get job offers, especially if you have experience. I get them every day still. You should be able to study for and pass in a few months, especially if you're taking time off from work. Don't forget that they just updated the exams again so the new books are out.
As far as your job now, if you're really unhappy then just leave. Maybe you can find something part-time just to keep busy, if you want.