Really?
Die from what? How did they know he would not survive the night?
Who were these "physicians" who was supposedly there and what are their accounts of the events?
What was the kid's specific diagnosis and underlying medical problem?
What was Cayce's supposed diagnosis?
What was his reasoning behind giving belladonna?
What was the dose of belladonna that was supposedly given?
When was it given and when was the kid finally "cured"?
Was this so called treatment used again by these "physicians" since it was apparently a "miracle"?
Who recorded this event and when?
Did these physicians publish their case in a medical journal?
What is the documentation of this supposedly event even occurring?
You're raising some good points, along with some dumb ones. If you're going to question whether Dr. House (a general practitioner in Hopkinsville, KY) and the other two doctors (Jackson, another general practitioner in Hopkinsville and Haggard, a pediatric specialist from Nashville, TN) were really "physicians", you had better put quotations marks around the alleged title of everyone on this Forum who claims to be some sort of professional. It is overwhelmingly documented that House was a physician, and that both he and his son believed implicitly in Cayce. I'm not as sure about Jackson and Haggard, but I would respectfully say that the proof that they were physicians is greater than for anyone posting here.
Cayce's diagnosis was that Tommy was suffering from an unusual epileptic condition, but he apparently did not state why the belladonna would cure that condition. It's not clear what dose was given to Tommy, other than it was a measured dose, not a homeopathic dose. Tommy fell asleep after being given the belladonna, and was fine the next morning, and so the cure was immediate. The cure was not a miracle, in that Cayce prescribed a powerful medication, rather than laying on hands or saying magic words. Whether any of the three physicians tried this same remedy in another case, I don't know, but presumably they would not have done so unless there was a nearly identical set of circumstances.
Now, since this event occurred in 1909, it's difficult to document it to the extent that it could be documented had it occurred in 2009. But a number of skeptics have examined the evidence, and I don't know of anyone who clams that this story was made up. I do agree, however, that at least one of the physicians should have written up the case in a medical journal. Kirkpatrick implies that doing so may not have been good for their careers, but this is a loose end. A bigger loose end is whether belladonna could have been efficacious for Tommy's condition. If you can prove that it could not have been, I'll award you a gold star.