I know for me personally when i start to crash i get irritable and just want to yell, cry and eat chocolate. my decent into depression usually takes a week or so. my dr has me write EVERY thing down, how i feel, how i sleep, what stress i experienced even how much caffeine i take in everything and after doing this i better understand my triggers and how to kind of regulate these things to help control the highs and lows. hope this is help to you.