Hi Martina, for me it is a sign of going towars maniac period, caus when I'm depressed i usually don't get close enough to a shop. in the "good" perios i'm so much concerned with thinking "don't know how long this lasts so i have to make good use of my mood and bu all the airplane tickets i ever wanted..."

then, again, I come out of a year of eating disorders and looking at my mood tracking i realise i substituted the eating attacks with buying...

maybe try to substitute it with the least harmful action (least harmful to your pockets), eg when you feel like buying and buying ask a friend to show you their dvd collection and borrow, or do sport, or any hobby. dont know if this is a good tipp for you, i m still trying to work out the solution for myself but this is as far as i can tell...

take care