Hi There are SO Many Different Autoimmune Diseases it is a mine field
I do think your Doctor is Looking all she can do is more tests or send you to a Rheumatologist or immunologist there is a test called a 'Whole Body Bone Scan' which will show up inflammation in effected areas
this can be a good diagnostic test, has she tested your RF (Rheumatoid Factor) ?
i'd most likely say she has , as you say "all of the other test are still coming back normal"
sometimes it even takes to re-do the blood tests as they can change depending on your body at the time
Try to stay positive and keep a good record of your symptoms as you can tell them to a specialist if you go.
FORUM MODERATOR Rheumatoid Arthritis for 30Yrs. Asthma,Fibromyalgia,Osteoperosis,Cervical Spondalosos,Degenerative Disc Disese,Disc Bulges, Diabetes,Heart SVT & AF, Sleep apnoea,Nocturnal Respiratory Failure,Panic Attacks,Anxiety
on; Methotrexate , Arava , Endone, Targin 20mg (oxycontin) , Prednisone, Metforman(Diabex) , Tambocor. Oxygen & Cpap, Prolia Injection ,Lyrica