Hi,
JoomFish should work with MySQL but they apparently have big issues.
As far as I know, Falang doesn't have these problems and it better supported. Which is why I recommended you to use it instead.
If you have problems with Falang, please contact their support for help. They are really responsive and will be able to help you with your issues.
I would recommend to unpublish all things related to Joomfish in your joomla (component, plugins), and remove all the tables related to JoomFish in your database (jf_content...). That should fix the access to your website.