Was depressed on and off for over a year,during that time my doc kept trying different antidepressants,celexa,amitriptiline,risperadol,trazadone,.......I honestly cant remember them all....anyways my depression would get better for a time,I'd think I was getting better then BAM I'd fall into the deepest pit again...I'm pretty sure that the AD's were also contributing to some rapid cycling.
My P doc told me that AD's are not normally used with bpd unless its used for only a Short period because it often makes bpd symptoms worse.

Hope your feeling better soon,good luck.