Apparently this doctor was based on some "Dr. Feelgood" character (as he was late dubbed in the media) who was really running around Madison Avenue during the late 60s. "Vitamin B" shots they were called according to my 74 year old mom, who called me up to discuss the ep.
Something that subset of corporate culture embraced for a small amount of time. Methamphetamine and a little vitamin B12 is more like it. Basically, he was giving speed shots.
Betty was right about Don and Megan. For a while, I thought the older black lady was the real Don Draper's nanny/caretaker when he was a child. She was creepy. Looked like Oprah Winfrey as Sofia in "The Color Purple."
Stalker Don is pathetic. Get some therapy and get past it, Don.