1) That sucks. Sorry.
2) If applying for the 2015-2016 match is your first application cycle, you may do better delaying your graduation on paper until after you submit your ERAS application. You will look like a first time applicant and may be able being lumped in with FMG's, frustrated un-matched surgeons et cetera. I've had a program director and a dean say this as a good thing to do for people who, for whatever reason, didn't apply or get a position during their MS4 year. But I'm not sure if this applies to you, or if this is still true, or ever was actually good advice.
3) Re: additional rotations. Talk to mentors in your specialty of choice. I don't think additional clerkships are particularly advantageous. It sounds like working hard for negative money and nil benefit given you already have an MD. Program Directors who interview you aren't going to be excited about whatever extra month you do.
4) Have a plan as soon as possible. Get a research position. Get some job at the medical school. Have an idea for how you're going to tell PD's on interviews how this experience will help you be a better resident.
5) Medical assistant probably isn't going to look good. MA's don't do what MD's do, even when the MD is PGY 0-1.
6) Also, don't take a 9 month vacation. Gaps will show up in interviews from here on out. While no one cares about a year off going to culinary school before med school of between 3rd and 4th year, once you've completed your forth year, long gaps start make people wonder if you're really committed to medicine. It's probably not fair, but PD's worst nightmare is a resident who quits halfway through intern year or ends up taking multiple unplanned leaves absences.
7) Don't, on the personal recommendation of a colleague in your speciality, do a three month global health experience with a small third world clinic with that, as it turns out, doesn't guarantee adequate supervision. Despite your best intentions you may find yourself in multiple questionably ethical situations. Again, advice from "a friend of mine."