Welcome, AAC. And I am sorry for the reason that brought you here.
You said your your son had 'the rash'. Do you mean that he had a bull's eye rash? I am not a Dr. However, everything I have read, EVERYTHING, conventional vs nonconventional, states that there is nothing ELSE that causes a bull's eye rash. Altho most people who contract Lyme do not get this rash, this rash ALWAYS means Lyme.
Until you are able to find a Lyme Literate Dr, I would strongly advise that you take him to a Dr who at least knows what a bull's eye rash is, and understands the urgency required for treatment.