Differences between book and show???

Spoilers:

I just finished the book and was curious about a couple of differences. I'll start with the obvious-

1. It appears all of the stories follow the same doctor with the exception of the last story (The Murderer) which follows a surgeon. I just wanted to get clarification from someone who knew for sure that all the stories follow a lineage except the last story which is a stand alone, right?

2. The doctor never had an affair with Pelagea in the books and she didn't die in the book either like in the show.

3. The doctor in the show has to deal with the revolution whereas in the book the doctor doesn't deal with it at all.

4. The longest story, Morphine, is largely a collection of diary entries that the main doctor is reading about a friend of his. It appears they discard his friend, and give the main doctor the morphine addiction in the show.

Since the chapters were published as individual stories, I just wanted to confirm that their is a common lineage between The Embroidered Towel, The Steel Windpipe, Black as Egypt's Night, Baptism by Rotation, Speckled Rash, The Blizzard, The Vanishing Eye, and Morphine. My last question is about the title. A Country Doctor's Notebook was about the main doctor's time I thought, but Morphine leads me to believe that the title comes from the doctor who kills himself in the story, Morhpine. Is it from the suicidal doctors diary entries of one chapter or from the previous chapters, or both? Idk blah