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.
If you move your head suddenly or if your head is pushed suddenly and abruptly, it can lead to straining of the neck, which would in turn lead to a stiff neck. At the same time, this sudden movement can cause an imbalance in your equilibrium, which would then lead to a feeling of dizziness. Another situation in which there could be a connection between the two is when the stiff neck is due to a nerve getting pressed.