Sounds like you have neither.
You are exhibiting symptoms of Borderline personality disorder. Bipolar patients experience mood shifts very infrequently (often one phase will last a week or more). Borderline patients however, can change mood from minute to minute. Do NOT take medical advice from random internet sites, they are absolutely not qualified to offer any diagnoses. I suggest visiting a certified clinician or maybe even a psychiatrist. Do not attempt to self medicate or self-diagnose- you will only see what you want to see.
More info on Borderline here: http://en.wikipedia.org/wiki/Borderl...ality_disorder