Bella,
Has your doctor also maybe given you an mri? How were your urinalysis results? Was everything clear there? I'm just "thinking" out loud, here, trying to think what might be going on with you. I have been dealing with unknown neurologic/poss. autoimmune issues, myself, for decades. In my case, everything lines up with MS or Lupus, but then my cancers sidetracked my work-up & now I'm in too much (untreated) pain & tired to do it...
And you definitely don't have an infection? Do you have pets? A cat maybe? I know these questions seem odd, but they *might* help, even if just to help rule out possible causes...
There's lots of folks here who may be able to help you, including some support and understanding, which certainly goes a long way sometimes, when all else is failing.