Hello Ent - Welcome! You will find quite a few of us here who have the positive ANA but no other specific AI marker. I am one of them with a diagnosis of UCTD (undifferentiated Connective tissue disease). It is true that a positive ANA by itself does not necessarily identify an autoimmune illness, and it's possible to be perfectly healthy with a positive result. However, a persistant and relatively high and/or climbing ANA along with symptoms is a pretty strong indicator that something AI is going on.
Do you have other symptoms? Generally, treatment to control your symptoms is more important than a specific diagnosis. A rheumatologist is the doctor to help you with autoimmune issues, but if yours isn't listening, I would look for another one. Finding one who will work with you may take a bit of looking.
There are links on here with helpful information about Lupus. www.lupus.org is a great place to start. And I'm sure someone else will be along to comment as well. Asking questions is important. This is a great place to start.
diagnoses: mono 1972; postviral CFS 1997; fibro 1998; UCTD & osteoporosis 2007; celiac 2009
meds: Plaquenil 400 mg, occasional low dose xanax for sleep aid, artificial tears w/ ointment at night, Advil/aspirin prn and lots of vitamins