Chances: Slim, but that's the case for everyone. Especially with your degree.
PGRE and GRE score needed: Perfect, and that's a minimum requirement that will do nothing but ensure your app is not thrown out at go, and only concerning gre scores it might be thrown out for a lot of other reasons.
Career: Good luck
I mean that, everyone in that area, all 12 that are employed and 100's unemployed are constantly concerned about that issue.
Fellowship: Nope, and prepare to TA your entire time even when doing research because your adviser will be super poor.
Honestly you'd be hard pressed to pick a more competitive area with the worst prospects of ever finding a job in the field. I love that stuff too and it's super interesting but take it up as a hobby. I'd bet if you crunched the numbers a person has a better chance of winning a major jackpot in the lottery or becoming a celebrity than making it in that field. In fact I know for sure the lottery one is true, and let's be honest if we've learned anything over the past decade we're all one "internet tape" away from fame lol.