Changed Hosts Now Getting Error

I change hosting companies last night, and everything appeared to be up and running. I posted something new to my site (smalldogarific.com) it appeared okay last night. I woke up this morning and the post is gone and now when I go to upload photos appear but each followed by the following error message: “Warning: filesize() [function.filesize]: Stat failed for /home/.meggie/maffiem/smalldogarific.com/wordpress/wp-content/uploads/2008/01/filename.jpg (errno=2 – No such file or directory) in /home/maffiem/public_html/wordpress/wp-admin/includes/upload.php on line 42”

Help! What happened? I have a VERY basic knowledge of all this stuff so if someone could walk me through step by step how to rectify this problem I would really appreciate it.