If you have a lot of PT observation/aide experience (like if you have 200 hours in a variety of settings, etc.), I wouldn't necessarily only look for aide positions, because they generally don't pay well.
If I didn't get into school this time around, I would be looking for the highest paying jobs I could find to start saving for grad school. That said, if you don't have a lot of observation experience, then getting an aide job would definitely be beneficial.
But like others said, look at your stats, and the schools you applied to, and see what needs work. If you need to take the GRE again to get a better score, then spend time prepping for that. If you didn't do too well in a course, try retaking it a community college. I don't know where you applied, but maybe you only applied to really competitive schools, so maybe apply to some other lower-ranked/less competitive schools next year in addition to your dream schools (where you go to school doesn't make a whole lot of difference in your starting salary anyway).
Personally, if I hadn't been accepted this year I was going to go do a one year master's program in biology education, so I would be able to get a job as a high school bio teacher if I wasn't accepted the next time around. My biggest fear was spending two years applying to school, working a minimum wage job and not getting into grad school, and then not knowing what to do, so I was going to cover my basis by getting a teaching certificate (which I'd enjoy doing. I work at a high school now as a TA and I enjoy it, and I do want to teach someday down the road after I retire from PT). But that's just me.
You could also look into getting your personal training certification - a nice way to make extra money, something still related to the PT world, and something to add to your application.
If you keep at it, I'm sure you'll make it work
(To quote Tim Gunn).