[billieball]

My nose has been broken quite badly 3 times (2 accidental, 1 intentional...by a surgeon), and I have had extensive sinus surgery. All of the smaller bones that form honeycomb-like networks between the sinus cavities were broken up and removed, my septum was modified, turbinate bones removed, and all passages opened up surgically (or should I say "mechanically?"). Though my actual sinus cavity lining has never been "cracked" as you describe yours, they have been modified to the max. After 3-4 weeks time, the healing process was mostly complete after my last surgical procedure. I was diving again within 6 weeks, with no problems at all. As a matter of fact, I think the modifications actually aid my equalization abilities. Good luck, take it easy, and go slowly when you get back in the water.
Saline flushes help a lot, too. They aid in the removal of mucosa/blood/etc... from your cavities before any infection can set in. You can get the pre-mixed saline sprays to irrigate, or you can create your own using a douche-like tubing system. Clean as a whistle!