after nearly 5 days of being manic I have finally fallen to a point of being depressed and it seriously came out of no where

I just ended up feeling like I was being selifsh and not helping out people that I care about as much as I needed to and started randomly balling my eyes out in my car...
not one of my greatest moments....this week with being snowed in and having FAIRLY expensive car issues has been incredibly stressful on me....in general..
I have always been fairly hard on myself ...but lately I just have seemed to be even more so as of lately.