headache, occipital neuralgia

Q: My situation is, for about a month I have been experiencing a pain in the back of my head. I don’t consider it a headache because it comes and goes quickly, but it is sharp. I also occasionally experience a feeling of goose bumps in the area. I don’t usually notice the pain when I am busy, but when I am not doing anything, I feel it. It is in a specific spot, not a general area and the spot is sensitive to the touch. I spoke to my doctor about it and am getting an MRI in a couple of days. Of course I have myself convinced it is a brain tumor. My doctor said it may be neuritis. After hearing this I ran home to look it up on the internet. From what I have read it sounds like it could be occipital neuritis but I am not sure. My question is, will an MRI be able to tell if it is neuritis, and is this kind of pain common to brain tumor. I don’t have any other symptoms other than the spot being sensitive and occasional goose bumps. Thank you for any help you can give me.