No you're not! I'm very much like this, I'm always really affected when something unexpected and negative happens when I'm prepared for something positive, it's like my emotional train has been forced onto a different track and it's a major effort to get it back on the right one.
You invested emotion, time and energy into a special day for your family and you were let down by third parties, who certainly had no right to have a go. The whole problem was their fault, not yours. I'm glad you managed to put it aside and had a wonderful day otherwise. I'm sure the bad memories will be blotted out by the good soon. Congratulations on the successes of the day!