I know that you may not want to hear this, but you story is all too common. It took almost a year before I received a positive diagnosis. And that was after they said that they were pretty certain that I had Lupus.
Many of us have been initially diagnosed with RA prior to receiving our Lupus diagnosis.
The problem is partly due to the fact that both diseases are auto-immune diseases and both have similar symptoms. Also, Lupus develops slowly in some of us and even changes during the diagnostic process. Lab work will not always confirm Lupus, so doctors are very reticent to make that diagnosis. Blood tests that are positive this month can be negative next month.
The other problem is that, all of the positive blood work that you've mentioned can also be attributed to other auto-immune diseases. So, diagnosing auto-immune diseases is just as frustrating to doctors as it is to us. They must go through a process of elimination in order to rule out diseases, one by one, until there is only one answer left. For many, an answer is never received and they are told that they have undifferentiated connective tissue disease (which means, there is an auto-immune problem going on, but doctor's don't know which one it is!).
You are lucky, however, that your doctors are treating you, even in the absence of a definite diagnoses. Many of us have not been that lucky and have had to endure pain and multiple symptoms without treatment because we were not diagnosed.
You appear to be doing a good job of keeping track of your symptoms, your meds and how they affect you. Keep this up, it will help you immensely when working with your doctors on a treatment regimen that works for you.
We are here to help you as much as we can by providing information, answering questions, or just giving you support. I wish you the very best.
Peace and Blessings