Good to hear that this collage found a loving home.
It is interesting to study what kind of things actually make us doubt when working/creating. At some point I developed a fear for empty canvases. I had great urge to form collages and paint but I was so afraid of making mistakes that I couldn't even begin one. I've received much help from Julia Camerons book called The Artist's Way. I tend to plan sometimes a bit too seriously before actually working with my canvases and the book helped me to discover how to find great results just by freeing the inner child and letting it just play with different materials and ideas. And the childs eyes saw so much more than I could have ever seen.
The results of using Camerons methods surprise me every time. Another great way to understand doubts better has been writing them down. They are easier to examine that way. Sometimes I even do short comic strips out of them. Do you write some kind of journal about your work/thoughts outside internet?
Oh, and I found and liked your Fb -page. It is beautiful!