Gas Chamber 
To dream of seeing yourself in a gas chamber indicates you are feeling trapped in your life or feel you are in a negative situation that is important to leave or get away from it.
Bereavement
Dreaming of experiencing bereavement or mourning after a loss of someone is a sign of sadness with guilt. Your mind may be signaling your sadness at the fact that loved one or something important is gone forever because of your bad habits or weird lifestyle. If this is the case, you're more likely to dream of that person or thing, or manifestation in another form. It is an expression of your sorrow that is seeping into your dream state.
Lord Voldemort
Voldemort in a dream represents an antagonist in your life. Voldemort may also represent negative feelings, thoughts, or emotions inside yourself.