Posts disappeared! Malware?

Last night I was uploading a PDF file to my photography blogsite, https://www.oldmainphotography.com. When I clicked “preview changes” to view the page, Google Chrome popped up with a bright red screen and said, “”Warning, this site contains (it listed a website, I can’t remember what it said) which has been known to contain spyware and malware. If you proceed you may harm your computer. This site may have been recently compromised by a hacker”. I didn’t proceed with the preview but went back to the admin area of my website. I can see all the post information from the back end but if I try to view a post, or even visit my blogsite, all there is is the top portion and no post information at all. I ran scans with on my PC with Webroot (which is my anti-virus, anti-spyware software) and it said no threats were detected. I really don’t think it’s a virus on my computer but happening online with the website. I tried to preview changes again and didn’t come up with the warning from Chrome, there just simply are no posts visible.

I contacted my cousin who hosts my blog for me and he thought it was a virus on my computer (highly unlikely, I think!) Has anyone else experienced this? What can I do about it?