If you have experienced a DDoS attack, you should probably consider looking at an anti-DDoS hosting solution that can mitigate attacks.
Most websites with a high volume of traffic have some sort of anti-DDoS system in place to ensure their service does not go down.
 | AbelohostA provider of shared hosting, offshore VPS hosting, and dedicated hosting. They also offer colocation services in their Netherlands data centre. Anti-DDoS protection is available on all hosting solutions. Their free DDoS protection offer 10gbps protection up to three hours per day. |
 | OVHOVH are the third largest hosting company in the world. They have over 220,000 servers across seventeen data centres in seventeen countries across the world. Their servers are unmanaged so you will need to hire a server management company if you use them. Their whole network has fantastic protection against DDoS attacks. Server prices start from as low as $69 per month. |