Hey all, so just an update on what's going on and what we're doing:
We attempted to install an add-on yesterday (that I know works because I've installed it before on the same version) but for whatever reason, it didn't play well the way I did it. It created a huge error that was causing immediate issues with how the site performed, so I removed the installed files for it (which cleared out a majority of the errors,) but now another add-on apparently used one of the resources that I deleted (not realizing it was shared, didn't look that way at all when I was doing it, but... I guess lol.)
So we've got an add-on that is causing the issues/errors. Murphy's Law showed up and won't let us disable it like we normally do (the other issue.) So there are ways to manually/force stop the add-on software, but we're not having much luck with it so far. I've just contacted the developer of the add-on, gave him our error log and explained what I did, so we're going to hopefully get answer on how he thinks we could proceed to go forward.
The other solution may be to run a restore on a previous backup point, which means we lose a few days of data but then the site WORKS at least lol...
No awesome, clear solution here, but there are hopefully still solutions, so I will be the first to keep you guys in the loop on what's up. If we get blatantly stuck, I'll hire a tech to fix it.
Apologies for our muck-up, honest to goodness didn't expect this to go tits up, so... I apologize for what I thought was a routine task (that has been routine for years prior.)