There are lots of things that can mimic MS and MS can mimic lots of things. For some the dx process is quick, while others it is long and drawn out. For me, it took about 3 years for a definite diagnosis, despite having lesions.

You can have a positive MRI and no clinical symptoms. You can also have clinical symptoms and a clear MRI. An MRI is just a tool, not a definitive test. MRI's are done in slices and can miss a lesion in that 1/4" slice.

Fibro and neuropathy are not often catch alls for when they can't find a definite diagnosis of a disease process. Many people live their entire lives without a dx of any disease but still have neurological symptoms.

Hang in there and let us know how things go. And ask any questions you want. There are so many great and supportive people on here with lots of knowledge and information.