On Day 22, I felt a sharp sticking or poking sensation in my abdomen.
I took 25 mg of Benadryl (antihistamine) and the sensation went
away.

This sensation was followed within hours by a bout of diarrhea. The
length of illness lasted about one day.

On days 23-25 I had very profound fatigue.

You should remember that I have rather several auto-immune diseases,
with side effects of strong fatigue anyway. This was way different.

During this fatigue, I was having a hard time keeping from falling
asleep when I was walking and talking with other people. I could not
drive. I could not function in the restroom without falling asleep.
It was really strong. I slept about 23 hours a day.

It was not at all painful, but I was out of commission. By Friday, the
effect was diminishing.