I think that everyone feels some sort of anxiety when it comes to vacationing. My vacation stress centers entirely around the days that we will actually be traveling. Will my flight be on time? Will I get thru airport security on time? Will my luggage meet me at my destination? The money aspect does not stress me out in the least.
Did you make a reasonable budget? Did you stick to a savings plan that was designed to ensure that the money to pay for your trip would be available when it was due? Did you make the appropriate adjustments to your plans when/if your financial situation changed? Did you make plans based on receiving money, gifts or incentives that may not materialize?
If you've done everything possible to make sure that your bases are covered, then relax!

You'll be just fine.