1992 Mitsubishi Diamante Car Alarm!! HELP!
 

So I'll try my best to take this through a step by step process:
It all started with my green Security light on my dash coming on a random times and of course if you try to move any of the door latches when that light is on the alarm will go off but NOW almost every time I open my car door, locked or not, the alarm will go off.
This is getting highly annoying and embarrassing and I want this to be fixed.
Is there anything I can do before having to pay up the big bucks at the dealer or an auto tech/alarm specialist?
Please help!!! I'm not even driving it anymore