My site can't be found in Google?

This site I created known as www.se-myanxietytreatment.com use to be found in Google. I could type in site:www.se-myanxietytreatment.com as well as index:www.se-myanxietytreatment.com and the doents could be found and the site was index. Now it's not. Can someone explain to me why it can't be found? Is there something wrong with the site? How can I get it back in the index/site of Google so I can perform SEO on it and increase traffic when people type in keyword phrases for searches?