I did the exact same, everything you just mentioned and more in my case... tbh my game didn't start going nuts and messing up until i bought and downloaded the L&&D pack... i don't think it's mods in my own opinion i think it;s the game itself. beacsue many many ppl are reporting issues since this latest update, and the issues are coming on not just pc's and mac's but also consoles and i've heard consoles can't have mods... at first i wasn't able to play my game for a good i believe 4 days at least!! then the following day my game self resolved some issues i had...
But issues were still there so i cleaned my game and my entire laptop along with mods etc. still had issues, but fortunately when seeking sims 4 gaming issues and seeing i wasn't the only one, a video showed where the game is now automatically changing itself to Directx11 (if i'm saying that correctly) instead of Directx9, but go into the game, under options, down on the right side there's Directx9... it should help some if not all the way... for me it helped only some....
There another video on youtube speaking about the Directx11 and 9... it's called Directx9 Expert Shares Secret to Reversing Directx11 Switch on the Sims 4... so far this is all i can say but again it didn't help with all the new issues in my own game but hopefully for others it does.
if this works for you or you've found another solution for issues such as
Saved Household Overlapping
when going into game mode the screen gets a freezing dark color that won't let you play
the game won't let you click on sims to interact (that got a bit better) but not to my liking of okay it works like no tomorrow.
if you see or hear solutions to these please please post and share :)