Hi and welcome to the forum. You do have some symptoms and patterns that are suggestive of MS, but the problem with MS is that there are many diseases that mimic it. Did they do a lot of blood tests to rule out other diseases like Lyme, Lupus, B12, etc.
My concern is that you are in the UK and I wonder if you had your MRI on a weak or old machine. We have seen that happen. Also, it seem that you can't always change consultants.
How thoroughly has your vision been looked at? Have you seen a neuro-ophthalmologist? That is a Eye Consultant that specializes in the effects of neurological disease on the eye. I can't believe that they are refusing to do a Visual Evoked Response.
The data we have says that as many as 1 in 20 people with MS will have a negative MRI, but that number does go down when you throw in a negative LP. Do you know for a fact that the fluid in the LP was sent for the MS panel - to calcualte the IgG Index and look for Oligoclonal ands?
Tell us about how your vision has gone funny. Has it been painful? Any change in your perception of colors?
Sometimes it helps to collect all of your data in a Timeline - like you have presented here, but more complete and specific. Here is one descritpion of a timeline:
http://www.medhelp.org/health_pages/Multiple-Sclerosis/The-Importance-of-the-Timeline/show/765?cid=36
It is incredibly frustrating to be having all these symptoms and not have any positive findings to show. Do you think your consultant is looking hard or has he written you off?
Stay here, others will be by to say hi. We have a whole contingent from the UK. they really understand what you are going through.
Quix