There have been a lot of (excellent) changes to HubPages while you were gone and some of the look and format of the site has changed. It sounds to me that you are looking at your profile. I suggest you go to the Button at the top-right of any page where it says your Hubber name. Click on your name and you will see a drop-down list. Click "My Account" and the page should load with all your Hubs and statistics. You can also edit from this page. If you have done this and you still don't see your old articles, first check the email you have associated with your account to see if your Hubs were moderated and unpublished (they should still appear in "My Account" even if they are unpublished.) If you still can't find them, I suggest contacting HubPages directly: http://hubpages.com/contact_us/
I hope this helps resolve your problem!