I see this post http://primemont.com/2012/10/12/the-changing-colors-are-a-welcome-sight/ Is it the one in question?
If it isn't the one you mean and if you created that post using the "Add New" on the main page for wordpress.com here http://wordpress.com/#!/post/ then what you describe can happen and worse still the draft posts may be lost and may not be recoverable.
If you created the post in your dashboard here http://primemont.com/wp-admin/post-new.php/ then you may be able to recover an earlier post revision.
Go to Posts > All Posts, hover over the title of the post, click Edit and check the Post Revisions module for previous saved versions of the post.
If you're not seeing the Revisions module while on the editor screen, click Screen Options (top right corner of your Admin page) http://en.support.wordpress.com/screen-options/ to activate it. Then select the post and page modules to include them. http://en.support.wordpress.com/modules/#list-of-modules Then you ought to be able to go here > Dashboard > All Posts > Posts and locate the post and recover it from post revisions.
If you cannot locate the post for locating and restoring a post revision, and it's not in your Trash folder http://en.support.wordpress.com/trash/ then you will not be able to recover it. http://en.support.wordpress.com/trash/#restoring-from-trash