This annoys me so much! I just spent the last 30 mins adding in a massive pricing section to my magic guide and then when I select all of the text to colour and bold it, (make it look nice) it fucking disappears!!!!! pressing ctrl+z did nothing as it sometimes does. So that's 30 minutes of high quality writing and I really can not be bothered to do it again right now.. too many calculations to redo >_<
I feel you bro, once I lost all my high-quality homework. GF like 5 hours time, I told the teacher that I lost it and I'm doing no more homework, never did. Ask "Rocker_hasan" from here who's my in real life friend to back me up on that.
I started doing this, too, after a couple bad experiences with writing something big, and accidentally deleting it.
I wrote an eBook review on HF before, and right as I was finishing it up, I selected the text to bold it, and the whole thing deleted (much like what happened to the OP).