Are These Just Mood Swings

I'm a 19 year old college student. I have been having these very strange mood swings. I can be perfectly fine and then all of a sudden, I'm just mad and depressed feeling. These moods come from nowhere and last all day, or for several days, then they just disappear. Often times during these periods, I have thoughts of suicide, but have never acted upon them. About 4 years ago my parents got a divorce, since then I have not spoken with my father, I wonder sometimes if this could be part of the problem. I would appreciate it if you would give me your opinion!

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