As we are not doctors, we cannot say if your symptoms do or do not point to Lupus. Most doctors, with a negative ANA, will not diagnose Lupus. There are over 60 auto-immune diseases and to find if you are suffering from any one (or a combination) of them will require lots of additional testing.
There is a rare condition known as ANA negative Lupus. The problem is that several of your other tests were negative also, so I assume that this is why your doctors are ruling out Lupus at this time.
Many Auto-immune diseases have the same symptoms (an, therefore, the same medications) so it is difficult to narrow it down for most doctors. I do hope, however, that they are treating your symptoms so that you can get some relief even though a firm diagnosis has not been made.
I wish you the very best!
Peace and Blessings
Look For The Good and Praise It!