Thank you, thank you, thank you for letting me know I am not the only one who finds out I have to rip out hours of work. And risk losing stitches and other messes.
Take heart - can you take some measurements of some finished part, or do some math and figure out if it really won't fit? My gauge was right on, but the sweater came out huge. I even knitted to two sizes smaller than I wear, with the correct gauge, and the sweater came out huge!
There is a section in the book Knitting Without Tears that gives advice on what to do if your garment is too small....
Sorry this happened , and I hope it works out.