Having a hard time finding a new job!

I have been looking for a new position with 12 hour shifts for the last two months. My background is mainly in outpatient as a GI nurse for 4 years, and now I work in a doctor's office, and I have been here for about 9 months. I have applied for a variety of positions including case management, short stay units, med-surg, mother baby, and PCU. Out of all the interviews, I was offered a job in the PCU, which I declined for various reasons. Now I want to know if I have the skills to get a job in the PCU, how come I am having trouble getting another offer? Any ideas to help me find a new position?