Sounds like an anxiety attact for lack of better words. I'm not familar with your condition, meds or situation but i've experienced short "rapid mood swings" simular to what you are describing and again for lack of better terms, I treat them as anxiety attacks. I agree with you, it doesnt sound like "another personality". And schizophrenia are more hallucigenic in nature. Not really "a train of thoughts running rampart" but external loss of touch with reality. I know you will talk with the "T" so not going to sugest that.. :-) but its nice your friend stuck with you and supported you.