Sims 4 not opening

I have the same problem. My Sims 4 game said that it was "Not responding" so I closed it. I went to install some custom content, then I tried to open the game. It wouldn't launch, so I tried again. No errors or anything, it just doesn't launch. It did the same swirly thing it does like when the Sims is loading to launch, but it doesn't launch. I tried from my Origin account, and it didn't work. I tried repairing and updating, and even using the Mod Conflict Detector (here), but nothing works. Please help me, as I am about to start a legacy on my Simblr and I really want to play again! ;-;