Not sure if i have some emotional or mental disorder?

my problem is one day i can be elated and happy, the next more depressed and some optomism about happiness, another i can be depressed and miserable and hate the world. this happens throughout the week. not sure if its a disorder or is cuz of wat i went through recently( my grandma who is like a mother to me is dying in a nursing home and my real mom who i havent seen in years has stage 4 lung cancer) any insight would be help full thanks.