Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to examine you and obtain a history, I can not tell you what the exact cause of your symptoms is. However I will try to provide you with some useful information.
MRI Spine:
It is essentially normal.
Between the vetebral bodies of the spinal column, is a disc, called the intervertebral disc. With age, there can be degenerative changes in the discs, with out any symptoms, but which are picked up on a MRI. "There is a focal area of annular signal change at the C5-C6 level with extruded disc cephalad over the posterior limbus of C5 vertebral body. No significant effacement of the cord is noted." means that there is minor protrusion of your C5-6 intervertebral disc, but this is not compressing on your spinal cord in any way. In other words it should not be causing neurological symptoms.
"The sagittal and axial T1 postgadolinium fat-sat sequences show a small amount of enhancement in the C5-C6 level in the posterior annulus." This again is probably pointing towards disc changes, which are not significant.
The rest of the report is basically saying that there is no abnormal process in your spinal cord. You may have been alarmed by this comment : " There is a vague amount of increased signal throughout the cord that may be of significance.", however I don't think this is anything to be concerned about since on the "transaxial images", which is a horizontal cut through the cord, your spinal cord appears normal.
MRI Brain:
It is very difficult to say what they mean, with out looking at the images. Usually bright spots, as implied by " areas of increased signal intensity" are not of significance. Some times these can be seen in patients who have a history of migraines or headaches. They can be seen with age, or with a history of high blood pressure, Diabetes , high cholesterol, smoking or heart disease. Some times they can be seen with multiple sclerosis, but these can be easily distinguished according to their location and their shape. In your MRI, it says there is "no enhancement" , meaning there is no active inflammatory, infectious, or malignant ( tumor) process going on.
I hope this helps. There is usually an "impression" at the end of every MRI report which discussed differential diagnoses, which should also help you.
Any suggestions would be great.