I feel your frustrations cause I am going through much the same thing. I had MRIs done in April and had one lesion in my brain and nothing on the spine/neck. Symptoms are all there, one lesion, blood work all comes back good (meaning mimicers are ruled out). Visual evoked potential came back good. Haven't had a lumbar puncture done yet; oddly hoping they do it at my next appointment on Tuesday and it shows something! I haven't gotten a diagnosis yet. Last appointment (end of August) the neurologist said my physical exam wasn't bad, but definitely seems some nerve damage/delay in my left leg.
I'm so sick of all the doctor visits and testing as well. At this point kind of wish they'd just find something and give me an answer already. It's been 9 months of pain, doctors, tests and no answers.
So, I feel your frustration and hope things get rolling for you and you can find a better state of 'normal' soon.