While their size and shape vary with location in the nervous system, most neurones contain the same parts: a cell body; a number of highly-branched outgrowths of the cell body called dendrites; a single, long nerve fibre (or axon) extending from the cell body; and branches at the end of the nerve fibre (axon terminals).
My doctor said that usually happens when blood pressure is high and you get that strange head sensation. But as I was reading some documents on net, I found out that it could also be some sort of a panic attack. You could try next time it happens to relax, try thinking on some peaceful place, and just calm down.
Or if I have my eyes closed I can't raise my hands for it feels the same way. Having a sensation of dizziness with changes in position is a relatively common problem. For example, if you have your head in a position lower than the rest of your body, you may have a sudden increase in blood flow to the brain that causes a sensation of dizziness. On the other hand, if you suddenly stand up, you may have rapid pooling of blood in the legs and a decrease in blood flow to the brain, which can also cause dizziness.