Is it possible that you actually miss the OLD sewing room? If your furniture/tools/machines are arranged differently, you need to learn a whole new routine/path around your space.
And with all that's in your life, you may not WANT new routines now, but the comfort of old ways.
When I replaced my cutting table in my sewing room, I was in a funk just because the new table had to be turned a different way in the room. (Go figure!)
Also... if you have collected too much stuff, it can be so overwhelming that you just don't know where to start. Perhaps it would be helpful to keep out the items you need for just one small easy project, and put everything else in boxes or opaque bins so you don't see it. That way you can focus on just one thing for now, and forget about the rest.
When you get the one project done, you might feel so pleased that you can face... two projects the next time!
How old is your son, by the way?