2 year just cries constantly

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I’m sure this normal but my nerves are shot beyond. From the moment my toddler wakes up till she goes to bed she cries and cries we get 1 good day out of the week the other 5-6 days she is tantruming, demanding us to do things and falls to the ground screaming when we don’t. Today is just one of the days.. crying constantly. She just turned two. It’s just so hard to deal with day in and day out.