Well, having just had a doctor make two misdiagnoses of TIAs, when they were nothing of the sort makes me feel that I would be better off with the opinion of people on GN than a doctor!
Thankfully, my real problem was not serious and has been dealt with, but I shudder to think of what might have happened had it been serious.
I do not think people on GN are telling people what the problem is, but they are suggesting possible diagnoses, and I can see no harm in knowing the wide variety of medical problems that the same symptoms can be.
When a doctor cannot tell the difference between a stroke and carpal tunnel syndrome, you need all the unqualified advice you can get.