Chatty, I believe this is called "retail therapy." An urge to buy something to make one's self feel better.

My maternal grandmother was a shopaholic. When she moved to a nursing home and my mother and aunt had to help her clean out the house, they discovered all sorts of "stuff" that she had bought over the years, much of it never used and still bearing the tags from the shop.

Obsessive redecorating sounds to me like it is a similar thing.
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