Yep, it was one of my biggest depression symptoms. Now that I'm on meds that help somewhat, it's not as bad, but I'll cry for the littlest random reason sometimes. Generally, my depression gets worse with PMS, so it happens a lot to me then (I know that can be normal for any woman, but it never affected me before I was diagnosed, so I attribute it to that), but it will also happen if I feel more depressed from stress or whatever else.

The best thing to do is to talk to someone about it or self-soothing activities like listening to music, reading, taking a bath, etc. You can google lists of a lot of ideas.

Hope you can figure it out and start to feel better. I know how much it sucks.