Wordpress is a special case, it’s self updateable.
Your stuff should not be lost at this point. If your not familiar with how Wordpress installs manually it’s going to be very hard to give you enough detail here to get you back on the road again. Perhaps Dreamhost support can help you recover from this one click disaster.
Also once you’re past this event, make sure that one click updater isn’t turned on. Only use the updates from the Wordpress dashboard.