I kind of found this post sweet, though I do agree that you might need a hobby...(and I mean that in a good way...)
My kids loved their legos and felt comforted that they were in the house. When my older son was in college, we moved and I gave them to Goodwill. I had warned him that I would be getting rid of lots of stuff, and he didn't tell me to keep them. When he found out they were gone, he was pretty upset. But for people who move every few years, it's too hard to do what some who live in the same house for years and years do - keep everything...
What you might do to help you feel better is put together a scrapbook/picture book of important milestones/awards etc for your son. I did that for one of my kids. I kept adding to it so much that I had to go to the Hallmark store and keep buying extension posts and pages. He's out of college now and it does mean a lot to him. I gave it to him right after he graduated high school. It featured baby up to present day pictures, awards, college acceptances, SAT/ACT scores, and all the cards he received from friends and family for graduation, along with pictures of him and them together that I was able to find.
It's really important for you to let him grow up, even though you see him as a "darling boy". He needs to learn to be responsible. He can't learn it if you do everything for him or bail him out of problems. Love doesn't mean do, do, do. Love means letting him learn, even if it's really hard for you to stay to the side and not jump in to help him all the time. And that also means letting him fall on his face some...
Enjoy this time. It does go fast!