Call the OSO. Like BZB alluded to there are a lot of factors that go into deciding if the OSO would even send an age waiver up the chain.
Some things that
might be in your favor: Did you apply for any sort of commissioning program before your illness? If so that may look good for you since it shows determination. What do you do for work currently? A high profile, physically/mentally demanding job
can be good too. How is your PFT score? The word from my OSO, they
WILL NOT even look at an applicant for age waiver without at least a 280. Do you have any sort of real world leadership experience? At your age the OSO is going to look for more than college clubs and frat president, unless you just got out of college.
I am in a similar situation, kinda. I was originally found NPQ in 2005 when I was applying for PLC (Empyema resulting from pneumonia). After more than a few more NPQ letters, lots of doctors visits and letters written by the doctors I was finally found PQ for commissioning in January 2012. My age waiver request is somewhere up the chain right now. I hope to hear back within the month. Then of course is the 1 in a few thousands chance I will actually be selected for OCS which will start another journey in and of itself.
As for right this moment there is not much to do, you can familiarize yourself with the
NAVMED Chapter 15 and the
Aeromedical Reference and Waiver Guide. See what applies to you and learn as much as you can about the process. Call the OSO and set up an appointment, you don't have any time to waste now.
Good luck and PM me if you have any more questions. Oh yeah, and just beware, active duty boards are few and far between. Look into OCC-R too.