I'm not sure as I haven't read it specifically. It might be about a man who is distinctively recognized by not wearing a hat, and perhaps his adventures, relationships or some kind of personal journey could be central to the story.
I don't know who the author of 'the man with no hat novel' is. There are so many novels out there and without more information, it's difficult to determine the author.
Well, I heard a story where a kid was given Benadryl for a mild allergic reaction. But the kid had a really strange reaction. He became overly agitated and started having nightmares. In another case, an adult took Benadryl as a sleep aid. However, she woke up in the middle of the night feeling like she couldn't move her body properly. It was really scary for her. And then there was a story about someone who took Benadryl and had a severe rash all over their body that wasn't there before taking the medicine.
I heard of a case where a person took Benadryl in a higher dose than recommended thinking it would work better for their allergy symptoms. But instead, they became extremely drowsy and disoriented. They couldn't recognize their own family members for a while and had trouble walking straight. It was a very scary situation for both them and their family as they didn't know if this was a permanent effect or if they would recover fully.
Benadryl can sometimes help with mange symptoms, but it's not a guaranteed cure. It might provide relief from itching, but mange usually requires more specific treatments.
One horror story is of a person who took excessive Benadryl to get a 'high'. They ended up having extreme hallucinations, seeing things that weren't there and became terrified. Their heart rate also skyrocketed and they felt very sick. They had to be rushed to the hospital.