Worry is for people who think they might do something different.
I never did understand worry. If you think you can influence an outcome to be more positive, why are you worrying about it? Make the change and reap the rewards. If you CANT affect the outcome, why are you worrying about it? Move on to something you CAN do something about, and let go of the results.
Being a consultant definitely takes more organizational skills (or a high enough hourly rate to outsource the details), but three years in I wouldnt say I WORRY about any of it. Of course, I support IT infrastructure for small businesses, which means there will always be as much work as I want to do. If youre a more narrowly defined consultant who specializes in something there probably is more stress and worry. Hopefully, you've set your labor rates accordingly.