So I've been keeping track for the past two months and I'm really starting to worry that I'm Bipolar. I've noticed that I'll stay depressed (by all standard definition) for about three weeks, then level off for a few days, followed by a week or less of fast paced speech, extra energy, and somewhat delusional thoughts. Then it's an immediate lapse into depression. It's not always a constant cycle either.

Just recently I was perfectly fine for a month or so, then out of nowhere I was extremely depressed, it was unbearable. I wasn't motivated to go to work, take a shower, or even eat a meal. Then I was practically bouncing off the walls today with this odd confidence. I'm expecting a crash, but I don't know when.

Secondly, I'm not on any psychiatric meds (even though I really should be) I haven't renewed my prescription since the last time I was in the hospital.

Is it possible to have such irregular cycles?