I am so sorry- I know how much it hurts to have gone through so much and still have a negative. Let yourself mourn this very real loss.
The rate of frozens that make it past the thaw is very high, but a lot still depends on what day they were frozen. Embryos often die out after day 3, which is why many REs prefer to do blastocyst transfers IF there are enough embryos to work with. (If there aren't very many, they usually do 3-day transfers so as to not risk missing a chance with the ones they have.) Frozen blasts, then, will have already passed that stage when a lot of embryos die off so they'd have the best chances statistically.
But that doesn't mean that embryos frozen early are of lesser quality. ALL embryos were 1-day, 2-day, 3-day embryos at some stage!
Good luck to you.