What a friend of mine does might work as a temporary fix for you.
She goes to the big department store, and picks up and carries around the clothes that really appeal to her. Then, at some point, when the load gets heavy, she starts replacing the less attractive ones and culls the pile down to the ones she really likes. Then she carries them around whilst shopping more. The absolute favorites, she takes into the dressing room. The rest she puts back. She hangs the ones that she thinks fit her best on one rack and puts the others in the discard pile.
Then she carries the ones she thinks she really wants around a bit longer.
By then, she has had possession of them for quite a while, and her appetite is satisfied. Most often, she puts them all back, and leaves the store quite content with all her money intact.
It doesn't address the WHY we think we need possessions to fill a hole that something else is making, but it does protect the pocketbook.
ShootingStar1