I also pick up new hobbies, or as you said, passions. Once I found "reborn dolls" as I entered mania. I spent about $600 on supplies and equipment. I got to work on a doll and spent hours trying to make it perfect. I was half way done with the hair when the mania stopped and I found I hated making dolls. That was the end of that experience. More often, I spend money on things I HAVE to have, NOW. Once I bought 20 LLBean v-neck pima cotton long sleeve shirts in different colors.Every few days another package would arrive with more shirts. As a child I can remember becoming obsessed with twirling a baton. I took classes, spent hours of every day twirling. Then one day it just stopped. I never touched the baton again. I have bipolar I and have had symptoms since mid childhood. Your story sounds very familiar to me.