Problem with Google search after website was down for 3 days.

My website gains approximately 3000 visits per day and increasing steadily due to natural process, no spamming or black hat technique. But since it's on a shared host, I upgraded it to VPS for more performance. Unfortunately, the processing was too long and the website was down for 3 days. Now the website doesn't show up on Google search result with usual keywords, even the domain name (ie. romajidesu), as a result the traffic drop to 1/3 of normal.
Has anyone experienced similar problem? How…
Problem with Google search after website was down for 3 days.

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