I'm a rapid cycler. I can switch moods several times a day, or stay in one mood for a week and then switch again. I know it's frustrating. You never know who you are going to be from minute to minute, like a Jekyl and Hyde thing.
I don't know why you are rapid cycling, but maybe knowing that someone else can relate helps.
"God grant me the serenity to accept the things I can not change, the courage to change the things I can and the wisdom to know the difference."
DX: ankylosing spondylitis, periferal neuropathy, chronic migraines/headaches, depression/panic attacks, bi-polar, hypothyroidism, hypoglycemia, sleep apnea
RX: synthroid, estradiol, cymbalta, geodon, lamictal, inderal la, klonopin, seroquel, imiprimine, aspirin, (relpax, phenergan, esgic plus PRN for migraine)
Surgeries: hysterectomy 1997, tonsillectomy 2001, deviated septum 2005, cataracts (both eyes) 2006