web page disapeared off my account but still running

So I went to go edit my website to update it and when I went into edit it the ERROR-404 came up on top of the site. I then refreshed and the page disappeared off of my account. I can not find it anywhere on my account but the page is still active on the web. 

Has anyone else experienced this and what did you do? Did you get it back? Is it hiding? Do i need to call the costumer support?