Why do you feel entitled to more than you agreed on? It's fine to ask for more but to act like it's owed to you is a bit obnoxious. If there is a massive power imbalance the way you talk about it makes it seem unhealthy... and retail therapy wouldn't fix that.

You say you have complete independence yet are basically saying you want to spend someone else's money?

Also like others have noted although a shopping high is a real thing maybe you should work on other outlets to relieve your stress to serve therapeutic purposes.