i am experiencing something weird . i had certain miserble situations in past that has remained in my memory forever. achaanak se vo kabhi bhi mere dimaag me aa jata h and i srart feeling very angry, sad , unable to think anything .few months ago it used to happen daily that i used to think of the person because of whom i feel miserable and angry when that memory hits me , tgen i used to create situtaions in my mind that foe exp. that person has done sth to me or said sth, then i start feeling angry when my brain automatically starts thinking, and i am taking revenge from that person with anger , this happens daily with me . my brain daily creates new situations that has never happened before and i get sad and angry over them . am i suffering from some mental illness,why is this happening , this situation is totally new to me?