Sleep deprivation looks like mania. Mania looks like sleep deprivation. One thing that has become clear to me is that sleep maintenance can do a LOT to help alleviate symptoms of bipolar. It doesn't eliminate the symptoms but make it more manageable. I would do as trippin' said and talk to a therapist/doctor. It is known that you can have temporary bipolar episodes that subside when life gets back to where you want it. Maybe the problem is you never got a chance to recover from the stress from 7 years ago? Exploring this may give you some answers as to your current state.

It's not always easy to recover from traumatic events.