Appearantly you have no hands-on experience trying to get a rare problem diagnosed by a doctor otherwise you'd be wiser and not reply with such a stupid remark. I have and after months of fruitless prodding I took matters into my own hand. Got an MRI and told the surgeon: here is the MRI scan, there is the problem so cut there and I'll be OK again.
Let me try and re-phrase it, with a question.
Someone suddenly becomes extremely seriously ill, and doesn't know why.
Which of the following are your best options (more than one can apply):
(1)...Get them to see Donald Trump, who claims they can cure everything
(2)...Get them to see en Engineer
(3)...See an appropriate Doctor (or medical professional)
I suggest the answer would seem to be (3).
(2) might be able to help you (e.g. they could search out the symptoms on the internet). But the thing is that their (likely) inexperience with medical matters, might lead to the wrong diagnosis. Which could seriously harm the patient.
EDIT:
As regards the MRI part of your reply.
Yes there are (probably) rare exceptions. But, nevertheless, seeing Doctors, is still the best initial (and usually later) thing to do. When someone becomes ill.