I agree saying nothing doesn't help much. I guess I and my wife have a long way to go to be able to relate better and more honestly. I guess I reacted the way I did/do because for me if I said something she'd shut me down pronto and blame me. I think the possibilty of anything besides that is small.
Is your wife concerned about the procedure ? That could be having an influence - her head is somewhere else right now. It may not have really been on purpose to upset you.