If you don't mind my asking, who is your surgeon?

I have bilateral TOS as well, and from what I've been told by a few surgeons it is not recommended to get the surgeries done so close together because of the danger of something happening to the phrenic nerve. You can breathe okay if one is damaged/irritated, but can't breathe if both are. Other than that it seems like a practical matter as well. I can't imagine that taking care of yourself will be easy and you don't know how long your recovery will be.

Having said that, I understand wanting to get this taken care of in one fell swoop. I will have to have the surgery soon and am not happy about having to wait a year between surgeries. I if I were in your situation if I got through the first surgery with absolutely no damage to my phrenic nerve I'd do the next one in three days (if I was sure I had the support to help take care of me afterwards, of course).