T-mobile needs to fix the data issue with Canada

Being up there that long, you have more than likely exceeded your high speed data allowance while roaming and are being throttled down to speeds so slow, that they aren't useable for much outside of basic e-mail.  The roaming oartner for Canada, which is Telus/Bell, have some not great band deployments in that province.  It's mostly band 66/n66.  Have you tried setting your network selection to manual and selecting Bell?  Bell has some other bands deployed sparsely in certain areas but the speeds, if you aren't being throttled should be a lot better.