I have many ms symptoms and i am scheduled for a brain and neck mri. what if they show nothing? will there be no diagnosis?

Multiple Dx...: Not knowing exactly what you mean by "ms symptoms" clouds the issue, but does not mean there is no diagnosis pending. At your age a number of neurological deficits, some of minor importance and some more significant, can mimic ms but i would wait for the MRI before despairing over lack of diagnosis.

MS tests pending: Some MS symptoms help make the diagnosis, and sometimes MRI testing is needed. When that fails, sometimes spinal tap testing is helpful. For now, it makes sense to get your test results before a plan is agreed on. To see, in general, how the MS diagnosis is made, try this tool: http://www.neurocuro.com/how-do-you-know-if-you-have-ms/

Variable: At age 72 yrs, I would doubt the answer for your symptoms is MS. "MS symptoms" could be very nonspecific and due to different disease process. Some doctors do not seem as open or definitive as others, and may communicate minimally. If yours is similar, you may need a second opinion. You see, there is ALWAYS an answer to symptoms, just need to find it.