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I have no idea what a practical nurse might be. Maybe you mean nurse practitioner certainly not an LPN. But might be serious is a long way from is likely to be serious. No doctor who likes keeping their medical license will refuse to see an established patient. That is abandonment and is taken very seriously by medical boards and trial attorneys.

If you are in the Villages Health System, they are not paid by you or per patient seen so it is not money. There are lots of places besides Lake Medical Imaging that can do Xrays and scans. They are going to get you in sooner. Lake Medical does not do stat MRIs no matter what the nurse ordered.

A headache can be just a headache or a brain tumor. See what I mean by "might be serious" A good history and good exam often guides the intensity of the evaluation. The nurse practitioners have far less training than MDs and DOs and within the Villages system they certainly discuss their cases with their supervising physicians.

If you want to communicate with your doctor, who you claim refuses to see you, send a portal message to the doctor asking what is the next step. What you might learn is that the next step is to wait until it is your turn to be imaged then to come back and be seen with that information now available.