Big problem with spam

Hi!
Sorry for my bigginer English…
I have big problem with spam in my website. But it is not a common problem! In addition to ordinary spam, I have a problem in recent days with a large avalanche spam attacks. All atacks save akismet, but it is heavy load to server. Look at this screen: https://plus.google.com/photos/108269453578187886435/albums/posts/5639641469429019986. It is terrible, because time between spams is very short. The only common cause is website (https://www.facebook.com/,https://www.google.com/,https://www.bing.com/ or https://www.yahoo.com/). I don’t know what to do about it. Please help me… Now I have solved this problem follows: https://podpora.endora.cz/viewtopic.php?f=27&t=3583#p18736 but it is not good! ??