several hours with the heart pounding. NO MORE GABA for me...I rested watched a JAPANESE show on relaxation from JAPAN, took two tylenol P.M. and hot tea with a little honey. I refused any HOSPITAL treatment. TOOO MUCH MONEY....someone suggested LEGATRIM @ night...that works just as good as the TYLENOL P.M>....scared the dickens out of me...GABA has some evil side effects which do NOT bother most people..JUST ME...