I think I'm going thru depression...

My father passed away on Dec.30 2015

And I don't know what to do I cry every time I drive back from work so my kids won't see crying....and the part that's affecting my kids it's that I snap all of sudden on then for any lil reason...one day I'm my self happy joking just myself the next day I'm down not feeling like doing a thing and I'll take a drive so I can cry and let everything out....don't know what to da this is to much to handle...I want help I'm I going thru a serious depression or just give it more time....