Update
I saw my doctor today, and she's referred me to a psychiatrist who specializes in general anxiety disorders (which I have), and who is covered by my OHIP (Ontario Health Insurance Program), since I obviously couldn't afford it on my own; with luck, I'll be able to start seeing him next week. She also had me take a little test, the results of which apparently meant I'm likely suffering from depression as well, so it's a good thing I'm going to be seeing somebody. The dosage of my anxiety meds has also been increased, which should be a big help (less helpful is the fact that they will now cost more, and that isn't covered by OHIP).