I have been out of work/life for 7 Plus weeks, my primary Dr. was stumped so she sent me to a neurologist, he said he's stumped at the first visit

I have had a head MRI that was negative, VNG testing that was normal, and 2 rounds of blood work that came back normal. My primary Dr. put me on prednisone for 16 days thinking something in the inner ear with no results. The neuro has me on topamax (3 weeks plus) with no relief from symptoms. Neuro is treating me for possible migrainous vertigo. Here is in short a list of my symptoms that have gradually came about over several weeks except the unstable gait was there one morning upon wakening. First started with headaches, nausea, tired all the time, eye sockets hurting and feeling really heavy, blurred vision, had eye floaters but they progressively got worse during this time, dizziness/floating sensation started, waking with headaches every morning, one week after all this was going on I woke with difficulty walking and my fine motor skills are challenging, and since I have and also my family and friends notice that my speech has changed, I say the wrong words, slur my words or can't say what I want to say. I am at my wits end trying to get diagnosed so I can get the right treatment and get fixed. In April I will lose my job and insurance because my 3 months medical leave will be up. Sorry for dropping all this on you.