It certainly sounds like you have been suffering from it for most of this year, and also that it hasn't been getting any better. So at this point surgery seems like the proper option.
I guess my concern would be the recovery timetable -- a fairly tight schedule to recover and then get fit. Seems like it might be easy to overdo it. I would think the main thing would be to get it fixed, and if that means putting off the AT, so be it.
On the other hand, maybe it will heal up nice and quickly. :-)