Who's your ISP and how are you connected to the Internet?
see this if you used Fiddler to chain to TOR or some upstream shared proxy provider (some geo-located VPNs, for instance) because Google sees a lot of unrelated traffic coming from a single IP address and it freaks out.
you could see this if you used Fiddler to modify requests in an unusual way (e.g. changing the user-agent string to something crazy or adding X-Forwarded-For headers and the like).
Other than those two things, are no known cases where Fiddler would cause you to see this without making modifications.
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