Since I had never heard of VTOS I had to look it up. Sounds like you are embarking on a major surgery, and recovery and outcome is unknown until one goes thru it all.
I always look for alternative therapies to all surgery and looked up alternatives to this surgery. Here it is, perhaps you know of it.
*copyrighted quote removed- available by following link*
Conservative (Non-Operative) Treatment of VTOS | Request PDF
Perhaps others here have comments, good wishes on whatever you do.