How many programs did you apply to and rank?
Find out if any of the AOA PM&R programs didn't fill. That would be the easy way.
You can try to apply to physician spots next year in ACGME...but they will be competitive. You could also apply advanced and categorical, but you would have to either repeat an internship or have a gap year. Not to mention that you have already failed to match ACGME PM&R once. You would have to do something substantial to be more competitive next time around.
I think having a plan B in the AOA match is a no brainer next year.