My site went down

What should I do? I got a huge traffic surge on the site and now my dedicated server is down because of it. My site is running on a dedicated server that I got from a friend’s company.

First the site went down completely in the middle of the day for 10 minutes. Then it came back up after 10 minutes but the performance was very slow. And now it’s down again. It’s like I am getting hit by so much traffic.

I can’t even access my stats to see what’s causing the traffic.