I can't, I just can't

Thank you to those who commented the previous entry.
Now, this one is different because I'm feeling different. Let me tell you about it.
I had a great idea some months ago. An idea that meant doing something I really like. Not that I don't like my present job, but I've been doing basically the same thing for about ten years and I thought that was everything my profession could offer me in the career ladder.
Suddenly, I get this wonderful idea and I start working on it right away. I had to collect a lot of info, then read it and after that do something creative with it.
I got started and two weeks after I stopped. I thought it was going to be a short, necessary break due to tiredness. But since then I haven't been able to restart the project. I guess the timing is not quite right. I don't feel like doing all the extra work it needs, at least right now.
Has anything like this ever happened to you? How have you solved it (if you have)?
Comments and ideas are more than welcome
CU all
peace

Enzo