How do I convince my Mom to see the Dr.?

My mother is 60 years old and just lost her husband (our father) a year ago. She has never been a good sleeper, but has now almost stopped sleeping all together because she is hallucinating. She sees people on the walls, bugs and small creatures on the floor and yells for help in the middle of the night because she sees smoke in her room. She falls asleep everywhere, all the time like while eating breakfast or in the bathroom. She is so convinced there are demons in her house and refuses to see her Dr on the basis that he will think she is crazy. We have been trying to convince her to see the Dr for the last 6 months but she is refusing help. My sister is considering having her committed to a mental health facility against her will, but I think it might make matters worse. I think she suffers from narcolepsy, but she is scared of the sleep clinic so she refuses to see them as well. Does anyone have any advice for me? I am exhausted, worried and extremely saddened by my mother's state of mind. Thank you