Should I be Pre-Med, Pre-Physical Therapy, or something else? I've heard so many different things, and I am confused. Anyone know?

It may depend on the university you wish to attend. You will need to contact the admissions for the exact university or universities and talk to them as to their specific requirements.

I went back to do some college classes last year ( online) and found the requirements varied greatly in my field from college to college for the same degree.

What kind of a "doctor" do you want to be? You can get a PT degree and go on to a Ph.D. in many areas or an M.D. and then specialize in a certain aspect of PT. Both doctorates will qualify you to teach in a university setting or do ground-breaking research in a lab.