Burst of Traffic - Site Inoperable. Need temp solution!

My site just got a huge burst of traffic.... which increased 100 fold overnight. The server which is a 2ghz 512mb celeron obviously cannot take it. Is there any kind of temp solution I could do to decrease the lag? maybe deny clients after the capacity is reached?
Pages take like 30 seconds to open, if they don't time out. Im showing over 1000 simultaneous connections over here.

 

 

 

 

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