MRI showed white spots on the brain

I went to the doctor because I having bad headaches and both of my wrists and ankles feel weak. Then I took MRI on my brain and it showed white spots. He said it maybe MS so I went to a brain doctor and then took MRI on my spine and it is normal. Also, all my blood work is normal. I asked him why I have white spots on my brain and he told me that it could be so many reasons and he not sure so I have to take the test on my brain in four more months. I want to know now, so do you know want wrong with me? Thanks