Having looked for something in my browser history last night I noticed I visit an average of about 200 webpages per day and I was wondering how many of these are SO. Any way to find out the total number of questions I have viewed (either total or unique)?
No, such thing is not tracked on the servers as far as I know. I strongly believe they just have counter how many people visited particular question, but not who visited.
That said, you'll have to resort to your browser.. Chrome allows you to search your history so here is a shortcut to display all stackoverflow.com pages you visited: