I have changed my home and site URL through my wordpress admin panel, and as a result disabled access to the website and to the admin panel.
After reading about the problem here
I changed the relevant fields in the database exactly as detailed in the instructions (edited wp-options->siteurl and wp-options->homeurl and gave them the original URL), but the problem was not resolved: the website, it's wordpress admin panel and FTP are all not accessible.
Any idea what is the problem (and how to fix it)?