Offered a job, resigned current job and then new job put on hold. I am now out of a job. What can I do?

I was offered a job, in writing. They had a quick start date and an immediate need. I was working PRN at the time of the offer, however it was 40 hours a week and I was making excellent money. I accepted the new position, better money, better company, better opportunities. I gave notice to the place I was working and was immediately escorted out of the building. Later that night, I received a text message from the new company advising that the position had been put on hold for a week. This was a month ago. The position is still on hold. I am looking for other opportunities, however, because of this offer of a job that never came to be. The person that offered me the job is of no help, she just keeps telling me to wait. I would not have given notice to the place I was working if I didn't have an actual written offer, with a start date. I am out of a month's worth of pay, with no end in site.