Stress and fear and dream. Happened.

My cousin brother passed away at the age of 19 and that was not a natural death due to accident after one month my 87years old grand mother passed away she was suffering serious illness,and after that my uncle passed away after one year...and after that I am always afraid and always I thought i loose someone...that is my ongoing fear at the time of sleeping I just check my closeone's  are breathing or not..and now in past one or two years(not regular basis) I saw my cousin brother in my dream and he is in a different place and now recently I saw my uncle also in my dream some times they spoke to me or sometimes they did not, and some time I saw they died in the dream,I m very much depressed. I loose my temper some times and I just want to cry loudly,I am a very nourvous kind of a person from childhood,now I loose my temper and I don't understand what happened.