I am having nightmares of a shadow like shapeless being trying to kill me. once it appeared to be more of an hallucination as i was half awake. ?

Nightmares, Anxiety: I feel your distress. Thank you for providing information about Obesity, Sleep Apnea, and medications-Metformin, Lisinopril and Prilosec. “Nightmares of a shadow like shapeless being trying to kill me” is frightening. It indicates traumatic experience with emotional turmoil and unresolved conflicts. See a Psychiatrist. See Physician for Sleep Study, Medication side effects, Diet, Exercise Program.

Many levels: My colleague has given you good advice. Without addressing whether there is a world beyond what we know, I have known people who have reported similar experiences greatly relieved by good choices, especially moral rearmament, conferring with a pastor who is sane and decent, and simple confident prayer as you understand it.