Congratulations! I have done the same thing!

At least I know that I am not alone anymore

Mine was an easy fix though.
I went to my LHBS and asked the propietor what I could do. Scott suggested to open all the bottles, place a small pinch, only a few grains of dried yeast in each bottle, add a heaping 1/2 teaspoon of sugar to the bottle and recap. Since I started out with no priming sugar in my brew, I was safe in adding the yeast and sugar. My brew carbonated FABULOUSLY!
Since you have already added sugar on two occasions, I wouldn't add anymore priming sugar until I knew it was safe to do so. Want to prevent BEER GRENADES you know. I would add the yeast and place the spent cap back on to protect your brew from infection. Put the cap on in such a way to vent the bottles and allow any priming sugar remaining to ferment out. After a few days, then add 1/2 teaspoon priming sugar and recap with a new cap.
Or take the chance, add some yeast, cap it and see what happens! You might be OK!
Good Luck!