The last one I had was at night, and it was so bad I was terrified to even move, severe chest pressure, burning pain straight through to my back, and a choking sensation. I can't say how long
it lasted, it seemed quite a while, but when you have pain time tends to drag. The next day I felt rather fatigued and weak. After the second day, I started feeling better and found it was easier to get a full breath than it had been in months.