Grief is a marathon, not a sprint. Just as you think you’ve left the tears and sorrow in the dust, grief creeps back in, hidden around the curve. As a parent who has lost a child, please don't tell me how to grieve.
Such emotional outbursts tend to last for anything from 30 seconds to a few minutes or even a few hours. Though emotional outbursts are a part of growing up, sometimes dealing with an emotional child can leave you feeling frustrated.