Hi there! Welcome to the forum (:
Your symptoms definitely do sound a lot like Lupus, but in the further stages. For some reason, people will actually show up with a negative ANA when they do have lupus, just as some people will show a false positive on a syphilis test, when they have no such thing.
It's all very tough to get through, and each person has a different case and different kinds of things to deal with.
I myself haven't been diagnosed with Lupus - i'm actually still waiting to see a rheumatologist, so I'm no specialist when it comes to things like this, especially when I haven't been sick for very long.
One thing that did stand out to me, was just a thought that you may have diabetes? Just a few things you said may have been warning signs, so perhaps you could get a blood glucose test from your doctor, to rule it out?
It's just a thought, of course.
I can't really tell you if you're in kidney failure or if you have Lupus or not, sorry, but I just wanted to stop in and say hi and welcome you to the group. I sincerely hope that you start to feel better and figure something out soon.
One day at a time, one breath at a time... We can get through this.