Some people get more frequent mood swings. How long has it been happening? A detailed history of your life is needed. Only then can one decide what will help you. In the meanwhile, Mindfulness meditation can be learnt from a teacher.

Hey dear .. If you feel sad / angry most times of the day & it is affecting your personal and social life.. It is better you consult a psychiatrist/ psychologist !!

How long do these episodes last Do they disturb your sleep appetite energy levels, libido and spoil your output. If it is repeatedly occurred and no significant impairment but more of nuisance then could be a personality issue. Then need to see a psychiatrist

Hello,  Please don’t think of yourself as crazy or idiotic for having such feelings. It is not abnormal for someone to experience mood swings. However, in order to fully understand your problems and the extent to which it troubles you, it would be preferential for you to visit a psychologist. You can also start by talking to a close friend or family member to see if that helps alleviate some of the symptoms. 

Hello....... Emotional lability is a term used to describe a tendency to laugh or cry unexpectedly at what might seem the wrong moment. Treatments are available for to help manage both emotional lability and depression.if you have reason to laugh or cry then it's normal, consult psychiatrist .