I have been getting a throbbing head when I stand to walk from a sitting position. The throb is very strong and I can't walk. I have to let the throb subsibe in order to walk. The strong throb last for a few minutes. If I sit down the throb seems to go away; but, If I stand up again, it will start again. I don't have this throbbing everyday. It seems to come and go every so many weeks or sometimes months. What can cause this condition to happen. I do believe I drink enough water. Can a dengenerative neck disks cause this? Thank you.