An unhappy experience with the hospital.

Two weeks ago, I had an extremely painful stomachache and diarrhea. I almost died on the toilet. The day after that, I went to the doctor and told him my condition. The doctor wanted my stool sample for further test testing.
I sent my stool sample to the hostipal a few days later. Two days after that, I got a phone call from the hospital, informing me that they were so sorry for losing my sample. They needed me to deliver the sample again. I was upset about their negligence. How could it happen ? Losing patients' samples is not professional. I didn't mind delivering the sample again. What really bothered me is that I had to watch my diet(be careful about what I ate) for 3 days because certain foods or vegetables might affect the result of stool test. I hope this time they don't lose my sample again.

Excellent Stanley!  Your figurative use of "I almost died..." is very good.  It sounds just like something we would say to exaggerate the pain a bit.

I hope you feel better now.