Maybe my experience can help you:
When I chose nursing as my second career, I had a lot of nurses encouraging me to do it and others who said, "Why don't you just be a PT so you have have nights, weekends, and holidays off." Anyway, I spent time shadowing nurses, PTs, OTs, etc... Their jobs all overlap but the focuses are different.
I work as a rehab aide in the hospital, and the PTs focus on evaluating the new PT orders, seeing the client, working with them to see how much they do can physically and have sessions to improve the patient's level of physical function. Really, it ended up being either bed exercises, walking with the patient as far as they can safely make it, transferring then into a bed or chair, etc. In the hospital environment, it's a pretty stable job although not always exciting. Many PTs work other PRN or FT jobs at outpatient clinics. One guy has his own practice. PTs do have a variety of areas they can move into.
However, PT school is competitive, expensive and hard. If you can manage that, It definitely seems like a great career to get into.
I'm choosing nursing as my second career because I want to be directly involved in the patient's medical care, not just one aspect of it. I believe PT would bore me after a short while. In nursing, there are just so many areas to switch into if you start getting burnt out. Not to mention that my nursing program at Community College is VERY CHEAP and lasts less than two years.
After shadowing and working in the hospital with PTs, OTs, and RN's, my gut tells me that I was right for choosing nursing.
See if your local hospital system has a way for you to volunteer or shadow PTs/nurses. Or you could even do like I did and find a job in the hospital as a nursing assistant, rehab aide, emergency dept. tech, unit secretary, etc. to give you exposure.