You are doing the right thing by getting second opinions. Here's an example of something that happened to me recently. This is not hair related, but is an example of why second opinions and specialists are so important. I was feeling some knee pain for a few months and it wasn't going away. I went to see my family doctor who I've been seeing for years. I think he's a great doctor. It's just that I found out, he doesn't know everything. He looked at my knee, check the range of motion, twisted and poked. Then he said, "It's just tendonitis. Give it some rest and you'll be fine". Well, after a couple more weeks, I felt there was something more serious wrong. I decided to find the best local orthopedic specialist on knees in my city. The difference was amazing. He immediately grabbed and twisted my knee such a way that allowed him to feel a certain "click". Which was a tell tail sign of a torn tendon.
Sorry to be long winded. Moral of the story. Doctors don't know everything about every field. See a specialist.
BTW - I got my prescription for Proscar from the Dr. I consulted with.