my boyfriend has had a problem for a while now. he has the feeling of fluid moving from the back of his head to the front on one side of his head after being at the front it goes to his throat . it makes him feel really unwell and his mood changes alot. he has had a scan but nothing there. doctors have given him different kind of pills but nothing seems to help.he can also stop breathing during the night and darts up to shake his head to make him come back life