Thanks for sharing the info on mri's.. I think I went too soon to have one.. I don't think going after only having symptoms for a month is enough time to detect lesions. If you never get lesions, can a doctor diagnose ms by symptoms alone?
An MRI is not the sole test to determine whether someone has MS. There is no one single test that determines that, but rather a cumulation of test results, ruling in some things, ruling out a host of other disorders, many of which look like MS...share symptoms with MS. Lesions don't always appear on early MRI's, but often a doctor will then do a spinal tap to see if there are o-bands in the spinal fluid, or the patient will exhibit enough clinical signs -- signs that can be seen, tested for, demonstrated, found, in a neuro examination, and be repeated over time (things like problems with balance, with vision, with bladder and/or bowel, with gait, strength in limbs, that sort of thing....not sensory stuff like numbness or tingling.)
While some doctors seem to rely on finding lesions on an MRI, others will only use that as one of many tools in their "diagnostic tool chest", and decide that there are enough clinical signs, and a positive spinal tap, to make their diagnosis.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....