Mike
                    
                    
                    
                    
                    
                    
                    
                        
                        
                         I've had it happen to me periodically,  usually in connection with digestive  problems and following stomach or rectal pains.     When I've felt the symptoms coming I've  had some success with    1) Drinking water and splashing water     in nasal area  2) Lying down  3) Massaging tense nerves/muscles in     feet, legs. and thighs     If