I'll probably delete this later but...

They don't happen all of the time. Sometimes I just feel consistently down for multiple months at a time, but frequently I'll have really severe mood swings. They were so bad as a teenager that my mom would scream and get angry at me. I'm an adult now and I still get them though. It's quite frustrating. Particularly the depression mood swing because I can feel it when right as it's coming on and can tell when it will hit, like a switch was flipped in my brain if that makes sense.