Theme is lost and website is down please help!

Hi
Can someone please help me with the following:

I have an established website and I have installed Geodirectory. My WP theme is MH Themes. In the compatibility plugin the mhtheme JSON does not seem to be accepted.
(I got the JSON code from the forum)
All was good until I added a Custom Post Type. The website has lost its theme and all visitors have disappeared. I have had NO traffic since I added the Custom post type.
I deactivated the geodirectory and that made the site crash.
I have now activated the plugin again and the site is up, but without theme and without traffic.

Can someone please help me? I have set it up with another website and all seems good. I cant see what difference there is between the two other than that the one it works on is new and has hardly any posts. The one it does not work on is big and established…..