I can totally sympathize with what you are experiencing. I was really having tough time for four months.
I just found one per diem position at a retirement home.
I rewrote my resume, so that it will catch an attention of human resource people first. I included what my
goal and passion is and what my strength is. I also made a list of all the facilities in the area and applied to each one of them.
Some places prefer online application process, but there are some that still accept an application locally at the facility. If that's the case, you might want to go there. It will increase your chance of finding out the name of person in charge of hiring. You might want to ask them if they may take any volunteer on the floor. Take one day at a time and keep applying! Don't give up!