When I broke my first (Osage self-bow) after spending 20+ hours working on it and it broke on me during tillering, I was aggravated and disheartened too. But I took it as a learning experience, I realized what I did wrong and jumped back on that horse. I am now working on my second.
I wouldn't be surprised if I break this one I am working on or the one's following. I guarantee you those guys who dish out bow after bow has had many of em break on them.
Notice though they only post the one's they make, not the one's they break! Too much is riding on their reputation to post a broken bow
Brush the dust off and get back on that horse!