don't stress too much, try not to be driven by myths and superstitions. I used to see my dead friends and relatives all the time in my dreams too. do whatever it takes to calm yourself down. Though I am not an advocate of any religious practices or religion, however if you happen to be one, then your superstitions might be an advantage to you to soothe yourself down. go to a temple or whatever to ease your mind and make it  stress free. Scientifically, in psychological terms your superstitious practices should help trigger a series of events in your brain which will release a chemical that will calm you down. Now I am no doctor, and I am not claiming it will help you with what you might see or might not in your dreams. However; I do not interpret seeing dead people in your dream as your time to die as well. I used to have dreams of my dead relatives and friends and even dead celebrities for a long time at one point of my life but here i am still alive and kicking. That relation of seeing dead ppl in ones dreams means you are going to die is absurd.