1995 Saturn SW1

Electrical problem
1995 Saturn SW1 4 cyl Two Wheel Drive Automatic

I started my car today and noticed quickly that I had no fan (air conditioner), no radio, and no wipers, and my engine light was on for about a 5 mile ride (engine light happened in past but not for last 2 1/2 months). I stopped by the place where I intended to get my oil changed, the guy just tried to help by checking fuses which were all okay, but he said he smelled something where the relay box is under the hood after looking at that. I went to start the car again at that location and everything worked again and it all worked for the 5 mile ride back home. But again, another guy there told me there was a smell coming from that box. What can I anticipate, and what should I do?