[motowebmaster]

Some network service providers do offer DDOS Mitigation Services, for an additional fee that can exceed the monthly cost of the respective backbone connection. Customers of most Tier 1 CoLo or Managed Hosting Facilities also have this option available to them. It's a premium-priced service.

One can Google "DDOS Mitigation Service" and find solutions that can help at the URL Level, but to be honest I've always been attacked at the Network Interface Level.

My service provider has the means to mitigate DDOS day-to-day, but they also maintain infrastructure used in temporary situations when a customer's server is getting hit with something serious.

You're in a tough situation.