I think I can relate to this somewhat. I don't do it anymore. But I had a very long history of coming up with projects, or new hobbies, I thought I wanted to pursue, going out & spending money on whatever I thought I needed to get started, & then just losing interest in the whole thing. I don't have an actual diagnosis. However, one psychiatrist I saw suggested there might be a bipolar element to what has gone on with me too.

As far as what to do about it... the only thing I can really say is that, as the old saying goes: "knowledge is power." Gradually, over the years, I began to develop some understanding of what I was doing. And so, now, when these urges come up, I see them for what they are. I smile to them, perhaps breathe into them, & let them go. It's a take-off on a practice that is referred to as "compassionate abiding." Here's a link to a description of the practice as it is used as a remedy for anxiety. However it works well for the types of urges we're talking about here as well:

https://mindsetdoc.wordpress.com/201...e-abiding-101/

Hope it can be of some help.