I just downloaded OS X Mavericks and now I'm missing emails. How can I fix this?

When I downloaded OS X Mavericks and re-opened mail I found that I had a gap of 3 months in my Gmail account on Apple Mail. Thousands of emails are now missing, but show up if I go to Gmail on the Internet. I don't know why this has happened and how to fix it. Any help would be great.

Try rebuilding the Gmail mailbox ..
Open Mail then select your Gmail mailbox on the left.
From the Mail menu bar click Mailbox > Rebuild

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