I once told a hairdresser to 'Stop cutting now!' as she tried to get both sides the same and failed, so she cut it some more, still not level, then went back to the first side again, which was when I told her to stop. The comment of a good friend who asked, 'Did you want it like that?' did make me laugh though!
It's upsetting when this sort of thing happens and of course there's the wait for it to grow back. If you really can't stand it why not buy a wig? Some are fantastic and people will just think it's your new style. 
Favourite small treat when feeling blue or conversely a bit flush

