1994 Holden Commodore Electrics going haywire

Hi there,
When I put my car into park to start it, it wont start but my hazard lights come on randomly, my park brake light comes on but the hand brake isnt on. My head lights flicker. If I jiggle the stick into park sometimes it will start but the radio goes off an on my ariel goes up and down, lights flicker. I am hoping it is an electrical problem and that my car is not possessed because it sure is acting that way. Any ideas?
The car also has alarm system and sometimes when I lock the car it unlocks itself straight away.

many thanks in advance
Lesley