I'm 22 years old, flight attendant. I've this issue of mood swing for more than a year now. Earlier it used to happen rarely but it's so frequent these days. I feel unhappy for no reason. I even end up crying at times. Everything is going well in my life. I have no such problem and yet I don't feel happy about things. I feel breathless, my stomach starts aching when this happens. Few days I'm all okay but then all of a sudden it's the same again.. I feel like I'm chocked. And this happens so frequently now a days. Also I feel tired and sleepy all the time. And few days I just can't fall asleep. Kindly help.