Tom,
For purely selfish reasons, I hope you stay in the swap (46 of the 138 packs I have wishlisted are your offerings, including 5 on my first page
). However, more than that, I want you to take good care of yourself. Most of those seeds will still be viable next year.
I'm praying that this next round of surgeries has the desired outcome. If you have to drop out of the swap, at least check in once in a while and let us know how you are doing.