The best way to deal with phobias is exposure to the stimulus. Even extreme phobias can be cured.Nothing that crazy, I just have arachnophobia. At times it annoys me when my friends just don't get it how much a phobia can affect a person. They keep saying "dude they're just spiders" and I know that, but they still scare the hell out of me. At worst I've had nights when I was unable to sleep because I had seen a picture of a tarantula and even several hours later I was unable to get it out of my head.
Few times while I was showering I got some weird panic attack that there might be a spider in the shower and just had to get out.
In games if there are spider enemies sometimes I have to look away from the screen and randomly attack and hope I kill the damn thing.
In Half Life 2 the black headcrabs in Ravenholm reminded me so much of spiders and scared me so much that my shirt was completely wet from cold sweat and I just closed my PC middle of the level.
And the most ridiculous part is that I live in Finland... we don't have giant spiders here but that doesn't stop my phobia :/
Best of luck to dealing with arachnophobia.