Rhino and septoplasty. And Paracetamol. I've read that if you take more than 4g a day, you could die?

Hello. I was given paracetamol of 1 g everytime I feel pain but I have been reading that if you take more than 4 g in a day you could die ? What if I need more than 4 g a day. It hurts. I take anticonceptive pills and escitalopram 10 mg. My doctor obviously knows this but why d he say I can take this 1 g paracetamol everytime I need. Then what if I go up 5 g ?