Hi LuvPie
I am not saying that something such as grasshoppers aren't eating your blossoms. But a problem I had earlier on one of my plants was blossom drop, which sounds like it may be similar to the troubles your having.
The tomato plant, in question, already had a decent amount of fruit developing on it...and we also had been having very cool wet days and nights in upper Illinois. I started to notice some of the blossoms withering away (above the blossom) and then dropping to the ground.
good luck!
dan