found my father-in-law dead in his bed

my boyfriend and i found his dad dead in his bed last sunday. he was dead for 5 days when we found him. he was 48 years old, possibly died from a heart attack. i just cant sleep at night.. i am scared. of the dark, i am afraid to be alone, i am just freaking out. the picture of his "face" just comes back every time i close my eyes. i dont even know if i am sleeping, if so its with my eyes open. i am a 19 years old girl completely traumatized.. i really liked him, my boyfriend loved his father. i know i am sad but i cant cry and i cant really feel the sadness. i cant feel nothing but anger and fear. i dont know how to handle that.. and my boyfriend, poor him. i dont know what to do to make him feel better, to make him "forget" that last image of his daddy😔