My cat is on amoxicillin from the vet

I hear the nastiest fart sounds and I look over and my cat is literally exploding with poop. He's in his litter box,

He's looking right at me like "I'm sorry" and SHITS ON THE WALL.

He turns around like "did I do that?" And then flings cat litter on the wall like "I'm so fucking sorry. I'll just cover that up"

And walks off.

I had to change the litter and clean shit off the wall. But now my entire house smells like cat asshole.

I've lit candles, sprayed air freshener.

Correction: it smells like cat asshole plus sweet pea candles

Oh my god.

1. How to eliminate the deathly smell?

2. Should i be concerned about the explosive diarrhea?

Yes the vet said this could happen but that was VERY excessive. I can't contact them now because it's 12 am.