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.
Again, only a trained doctor can diagnose the cause of your head pressure, as head pressure can be caused by anything from anxiety to brain tumors. 1  Tends to occur during periods of feeling stressed/anxious. 2  Tends to occur with other anxiety symptoms.  Tends to go in and out depending on your level of anxiety/stress.