Jaclyn - Like Desiree said everything happens for a reason. Just remember that the day is about you and Joe beginning your life together. Although it is nice to have everyone there, we all know life doesn't always work out as planned. You and Joe are going to have an amazing wedding day, wedding trip and life together. Try to think of the positives, I know, easier said then done.
I am thinking of you though and keeping my fingers crossed that eveyone gets to go and your dream wedding is a reality!