Should I be worried? Whats really going on?

I'm having my surgery at the WLSC in Kansas City on the 14th. They called me today to tell me that the original Dr. (Dr. Nigro) had a problem and wouldn't be able to do any surgery for about 4-6 weeks. So they wanted me to go with another Dr. I guess it doesn't bother me too much, but it does make me wonder, what is really going on? They said he had an accident??? I don't really want to start my preop diet again, and I don't really want to wait that long, so I'm planning on going ahead with the other surgeon. I wish I could remember the name of the surgeon.