Hi Debi,
Those were good points by Pinkynose. I agree on having a serial comparison of your nerve conduction, especially with worsening symptoms. By all means get that MRI and see what the verdict is. I have personally known 3 people who had spinal surgery due to issues in their arms.
I always say that it never hurts to get information. You can decide later what to do with it.
I hope all goes well,