According to the symptoms you reported (feeling happy and then sad and low, crying for no reason) it is possible that you might be experiencing bipolar disorder. Bipolar disorder is a condition in which a constant mood change between happiness and sadness occurs.
Mood stabilizers are given to reduce the mood shifts. They include: lithium, carbamazepine and lamotrigine.
There are several types of bipolar disorder. There are small, but significant differences between them, which are best noticed by a psychiatrist.
Therefore, you might want to visit a psychotherapist for evaluation, continuous observation, and adequate therapy.
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