Hello,
Welcome to the ehealthforum and I am glad to help you out. Your symptoms of sudden crying are suggestive of depression. Depression is a mental disorder characterized by a pervasive low mood, loss of interest in usual activities and diminished ability to experience pleasure.
The three most commonly indicated treatments for depression are psychotherapy, medication (antidepressants), and electroconvulsive therapy. You should talk to your family members because the support that they can provide is one of the best medicine. If the symptoms persist then please consult your psychiatrist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.