I am experiencing the same symptoms. I bought a "neck pillow", but it has not helped the sensations in my head. At first they thought I was having sinus problems. Yesterday they did an MRI on my brain (as the MRI on my neck afew weeks ago turned out normal). They are looking for lesions on the brain for signs of MS or other brain disease. I am praying it is as simple as a pinched nerve near my skull.
I found out that I had herniated disks in my neck. Nothing severe, what helped was a hundred and something dollar pillow from tempur-pedic. Sleep on this pillow and it will go away. It worked for me, anyway. Good Luck. Spring for the pillow!!!!
I am having the same problem. Let me know if you find out any info. ***@**** Thanks