My roommate was addicted to diphenhydramine. She had difficulty sleeping because of allergies so she took this medication for both. But she kept increasing the dose because the old dose was no longer working. I kept warning her about it but she never listened to me. If she didn't take her medicine, she couldn't sleep and started experiencing anxiety attacks and difficulty breathing.
One day, I came home and found her on the floor. She was extremely confused and was hallucinating. She didn't know where she was. It was very scary. I called an ambulance and took her to the ER. They found extremely high doses of diphenhydramine in her blood and it took her days to recover.
I don't live with her anymore but last I spoke to her, she told me that she doesn't use any medications. I hope so, for her sake.