How Temp Acc Wrote use cloudflare under attack or contact the Support. If your Website is being ddosed you can also get read of cloudflare while being attacked
DDosing is a fucking pain in the arse mate has happened to me about 100 times on many of my old servers
best thing to do is talk to your host and tell them your constantly getting ddos attacks on your forums and they should be able to help you out depenind on who your host is