1. "both Fidelity and Canadian Revenue Agency say I have to file a US tax return to claim it back" - this is true.
2. "Can I do multiple years or do I have to file individually for each year?" - you will file individually for each year.
3. "Which product will work?" - Follow dmertz's link above.
4. Although we Americans will be sad to see your tax dollars leave the country, I wish you luck with a simple and straightforward refund process...
