I'm sorry to hear that you're experiencing DDOS problems. I know it can be frustrating to not be able to trust on the technology we've come to rely on.
Unfortunately, this isn't something that we're going to be able to help with. In order to combat this kind of thing, you're probably going to need to contact a computer security professional or some other local expert that can assist with diagnosing how you're being attacked and create a solution for you. You'll probably want to search the web for "DDOS mitigation" or "DDOS defense".
I hope that helps!