As long as I can remeber I've been terrified of mermaids. I have no idea why, but I am. If I see one, even a cartoon, I start shaking and I've fainted as well. What has worked for me is looking at fish. I'll just go to the pet shop or an aquarium and just stare at them. It's helped a lot, I can now look at a picture, like Ariel from the Little Mermaid(C) Disney and not pass out!