Update:
- after checking more the first MRI it is clear the lesion was in the right temporal lobe. I also took a new MRI last week and it showed the lesion, still there, 1 cm long, in the right temporal lobe. The lesion does not charge with contrast , so neuro rulled out a brain tumor. And because it is only one. MS has also been ruled out. Does anyone know what the nature of this lesion could be? Are my symtomps in any way related to it?
First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
The concerning part of the story is the weight loss, nausea and pain that you described in the begining, which is a story concerning for a brain tumor. However, if your MRI is truly negative, then I suspect you are dealing with a varient of migraine headaches (I would suggest a repeat MRI in 6 months with contrast). Migraines (does not have to have the 'typical' headache (headpain) associated with it) and can be seen with all the feature you describe. Blurred/ halo vision is often seen in migraine auras and the loss of balance and confusion is also common. Many times the neck can be the source of the migraines and often requires physical therapy. I would recommend that you start a migraine preventative medication such as zanaflex, elavil, topamax, etc. and assess its affect on your symptoms after 2-3 weeks.
I hope this has been helpful.
I have not had your MRI findings myself, but I have experienced an off balance feeling accompanied by focus issues and other symptoms you mentioned. It is always possible that you have an irritated or slipped neck disk which could make your neck hurt and also make your head feel off-kilter so-to-speak. I'm not saying it's one thing or the other, just throwing it out there.
Could it be MS or Chiari malformation? Just a thought.