Hi. Its tough waiting eh. Most people would be a "worry wart". Surgery is because there is a need and probably not because you are trying to update to a shiny new knee for cosmetic reasons.
I know that its something I think about every day just trying to get by within the limitations a knee issue causes.
Its one thing to know standard practice and wait times but its quite differant living with the reality.
If waiting is what is required, use the opportunity to get everything sorted for post surgery. This site has great info regarding process, equipment required and strategies to assist both pre and post op living.