I was a mall shopping fool when I was manic, and took out a credit card my husband didn't know about. We were making good money back then, so it didn't impact us much.... a few years later and after a divorce, I had a mania due to steroids and ruined my credit and am still paying that off (and it was only $5,000, but now I'm on disability).

The size of mania spending is really dependent on your income and credit rating, I think. These days, $100 could ruin me for a month! So when I start feeling manic, I hand all the money over to my hubby until things settle down.