It's sure looking like it's not even in DreamHost's DNS.
I suggest you give it a refresh by going to the Panel for Domains -> Manage Domains and click Edit for your domain. Then go to its Fully Hosted settings and click the "Change Fully Hosted Settings Now" button, even though you really didn't change anything. This forces a refresh of its DNS settings and such.
In the mean time, submit a ticket to Support explaining what you've done so far.