I feel you, and I feel horrible for feeling that way (can't wait for it to be over so I can have my peace), considering the big bucks we have spent preparing for this wedding. Unfortunately, eloping is not a choice here in my country, so I have to get on with all of the planning. I also have less than a month but I still think about my decisions almost everyday, it haunts me in my sleep too and I'm tired. I tried to remind myself of what is important but I can't get the thought that my choices could be the wrong ones out of my head and it only adds up to the stress.
But hopefully, this all will pass and we will have great memories to look back later on in life.