I'm so sorry you are living the uncertainty.
In my experience (3 years in limbo), neuros, for whatever reason, seem to think it is reassuring to us when they boldly say, "No it is not ms."
The problem lies when eventually, if it IS ms, they have to eat their words.
We have no idea if you have ms or not, unfortunately. What I will say -- you are being followed if you have another MRI and visit in 6 months. Unfortunately, this is the nature of the diagnostic process. You have not been dismissed to another specialist, so therefore it is not "definitely not" ms. It is, perhaps, "not likely" ms.
As your neurologist follows you, watches your MRIs, neuro exams, etc. He or she will eventually have enough information to diagnose you. WIth ms, or with a mimic.
How was your neuro exam? Reflexes etc. How long do your "episodes" last? I am guessing that one of your neuro's reasons for hesitation is because of the locations of your lesions -- of the lesions areas considered diagnostic for ms by the McDonald criteria (2010), you only have one. And Lyme is certainly an ms mimic. I'm not too familiar with Lyme but someone who is will likely contribute shortly.
In certain cases, diagnosis moves rapidly for ms or a mimic, but it requires textbook lesions, in textbook locations, with clear neuro exam results and currently active lesions as well. The rest of us take a little ... Lot ... longer.
Feel free to ask questions here any time :). Many of us have been, or are still in, your shoes.
Lyme actually mimics MS Symptoms, so I would go back and have that re-evaluated more closely. If your current doctor refuses to have to tested, go to someone that will.
As far as MS, you have to be dx'd positive for at least 2/3 of the tests that they give you:
Tests to diagnose MS
1) Magnetic resonance imaging (MRI) of the brain and spinal cord. This test is done to confirm a diagnosis of MS .
2) Lumbar puncture (sometimes called a spinal tap). This test may be done to evaluate cerebrospinal fluid. (which you did show Oli bands - my doctor said that my fluids were high on at least 8 levels of the test)
Evoked potential testing. (Nerve Stimulation Test - basically they hook you up to a machine that sends electric pulses that measure your muscle reaction)
If you did "pass" 2/3, then you might want to go back to your doctor and ask them more questions.
If you want to talk more about it, you might have to find me on FB. I'm only here once in awhile.
Sandie Jones, Santa Clarita, CA
Is you neurologist a MS Specialist? If not you might want to see one. That said no test rules MS in or out it is all part of the puzzle. It can take years for a diagnosis. Neurologists like to follow you over time. The way they look at it is this it is not MS until they have enough evidence that it is MS. For me that was two years of testing.