what is it?

Just when everything seems to be alright then there the “it” comes…. And everything changes… like a doing a back-flip landing face down on the floor… then suddenly.. I just want to quit on everything… nothings making my day anymore… everything seems like a complete mess… cant appreciate anything at all….. is this the feeling of being desperate? Or is this something else.. Would I end up suicidal? Or I’ll end up on those four walled rooms and tied up in straight jacket? Crap…