My Mom Is In Hospital Came In Chest Pain Cardiac

My mom is in hospital came in chest pain cardiac enzymes OK diabetic chf copy was doing better probably should have gone couple days ago but yesterday started Co stomach pain and nausea CT abd neg. Wasn't sleeping w r ll for last several days then last night went to sleep very somnolence won't talk now sleeps but occasionally opens eyes looks at you as not sure c who you are or saying. Mr of brain neg for ischemia on blood thinner normally not on o2 but sat dropping while asleep on o2 now what can be wrong what else should be checked Dr's say everything is showing neg