I think you was too tired. It makes sense. I think you navigate the murky waters in those last 3 games better with more stamina. You will bounce back strong. I have no doubt! Keep your head high Vasif! Thanks for sharing your experiences also.
hard luck, maybe you are tired , you say in the recap , "you miss some variations, and didn't prepare for opponent and etc.." you have to fix this , you are playing tough tournaments not easy one , i think you need some rest and review and study you repertoire.