If it's been less than 72 hours then antivirals help - acyclovir or similar. Especially if there is face involvement - if it's anywhere near your eye this is really, really important. Otherwise it just tends to help some.
What's available over the counter in Canadia? If you can get codeine or tramadol or something similar those tend to help. In the great pill-washed States we tend to use the strong stuff for shingles - Percocet, etc.
Otherwise marijuana is probably a good idea. It certainly won't hurt.
Also, as a postscript, I only learned this week that Justin Bieber is Canadian. So fuck you, Boots. Fuck you right in your shingles-ridden ear.
,
Victor