I don't know what to say on the various readings other than Lupus does that..one hour you can be positive and the next negative. I have had Lupus for 20 years and my doctor randomly runs tests at various times and they fluctuate. As for being negative and being fatigued, well that happens a lot too...and sometimes I think the lab results aren't always accurate. After so many years I can normally tell when I am flaring. Even something as simple as what you consumed for breakfast can trigger a flare or it can receed a flare coming on. And sometimes it doesn't matter and the body flares....but normally that would be due to depleting the body of it's energy which isn't a grand scale affair with this disease and it sounds like your much like me in that I have plenty of energy just not what I think I should have! ha! The first 15 years I was extremely active but quite young as well, I was diagnosed at 24 yrs. of age....at any rate I was able to work out and stay active but at 44 I'm starting to slow down...however! I am more active than most people I know who are perfectly healthy....but that is a lot of work on my part, another words they are just lazy and if I had their health I would run circles around them! LOL. I eat organics, no sugar, no dairy, no chemicals of any kind in my home or on my body...etc. It's a great deal of effort but it's worth it to have "quality" life than just living to live and feeling rotten all the time, plus I don't have to take any of those rotten medications, I REFUSE!! Continue to take good care of yourself, it is well worth the effort. Good supplements are an absolute necessity as well.
Don't sweat those tests, Lupus is an immune disorder and it's a complex system and hard to get a complete profile on. The first five years I had this I was positive the whole time and with a great deal of effort described above, I was able to put it into remission in longer and longer spurts which is what happens with the tests, one day it's there the next it isn't, so if you do have Lupus, then you are already a great deal ahead of things with treating your body kindly. Best of wishes to you and make sure you are not taking a prescription drug that could be inducing Lupus.