Need someone to fix PHP and access denied errors on WordPress Site

On Friday at least 14 plugins on my site needed updating, I tried updating all the plugins at once. Once I did that, I started seeing an access denied error. I can't access my WordPress admin to deactivate or reinstall plugins. I think the Access Denied issue came from the WTC3 plugin. That usually puts extra code in the .htaccess file. But now there are PHP errors coming from various plugins. Looking for someone well versed in WordPress, .htaccess rules, PHP. Here's what I've already done to try and 'fix' the issue.... I replaced the plugin folder with a backup I had, thinking it would revert everything. Once I did that. I started seeing a php error from one of the plugins. I changed the name of the plugin folder, the site loaded but I would still get the access denied message when I tried to go anywhere but the home page. So... I've created a new sub-directory in my file manager (and changed the name of the old directory) just so I can show a 'maintenance' notice. Looking for someone to help me get this fixed today.