The best way to manage your emotion is : Understand your emotional needs. In order to manage your emotions, you need to fully understand them. All of us have certain emotional needs that are just as important as our physical needs. Spend some time taking an inventory of the emotional needs that are most important to you.
Try to accept first that you have an emotional problem and you can't manage your emotion when the red days are coming and to deal with it, you need to find some other things that you can do to change your mood / feeling.
That's the way I'm managing my emotion, I accept that I have some emotional problem but I'm not that crazy to say that I have mental illness, it's different.
Just know your limitations and when your emotion is starting to trigger you, just keep on focusing with your goal and try to breath some fresh air.
All the humans have emotional problems but a person can increase his control rather he can learn to stay happy in all sort of situations by exercising and running in the morning. Physical activities keep our morals high. We must keep one thing in our mind before making any decision under unpleasing situations that time does not remain same forever. It will change and life just tests us in different ways.