What causes a feeling like you vigorously rock your head back & forth few times.no headache nor dizziness. too much concentration on laptop,hunger &sleepiness worsen up the feeling.mri,ct scans & blood tests were conducted,all was found to be normal.

Titubation: Head tremors can be caused by increased blood flow to brain vessels- eg- a leaky valve like aortic valve with hyperdynamic circulation ,also could be caused by diseases like Parkinson's disease ,Presenility causing tremors of senility. Consulting a neurologist will be helpful. Also get an echocardiogram to r/o cardiac valve issues. It is good idea to see a cardiologist to get physically examined