What's up with Houston Agencies/Hospitals

I have been a LVN for 20 years (man, I am getting REALLY OLD), and most of that time I have been an agency nurse. Recently I moved back to Texas and reg. with my old agency, and a new one. Though I prefer working pedi/ and step down nursery, I can work well on any floor except ICU and L&D, so I started getting my bookings easily enough, but only a couple of days in advance. And out of two weeks, all days were cancelled but one!
Now, used to--------- agencies fought over getting nurses, and GOOD nurses were able to recieve a schudule a week in advance or from some hospitals a month at a time. I can't with all these cancellations, so I went and reg. with three more agencies, (WHAT A PAIN IN THE BUTT) And seems they book only a couple of days in advance too.
WHAT IS THE DEAL? Is agency nursing dead in Houston, or is the nursing shortage over down here, or what is going on????