2002 volvo station wagon shaking check engine light flashing

I have a 2002 volvo station wagon. Today I was driving it and it started shaking intensely while stopped and driving. The check engine light started flashing. I immediately pulled over and I’m taking my car to the mechanic on Monday. Does anybody know what could’ve caused this and what the process is to fix it? There was a bad smell, and the car almost was making a ticking noise.