The last 2 times, where there has been a traumatic event and I cry profusely, I can't stop sneezing afterward. I sneeze the regular sneeze, but I also start the sneeze, but end up making some strange noise instead, even though I'm not trying to hold them in. This happens for about 1-2 hrs at a time and is constant... and feels much like a cat hair is tickling the very inside of my nose, but nothing will make it go away.
Why does this happen??

Crying inflames the lining of the nose. Those inflamed cells also stimulate the triggers for sneezing - very similar to when you get a cold which makes you sneeze and causes excess mucous secretions.