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Rotten egg smell from exhaust is typically caused by sulfur in the catalytic converter burning off. That can be caused by driving the car harder than normal, or harder than previously, making the converter heat up. If you have exhaust leaking into the car, you will smell it.
We will need a better characterization of the "shaking" to help you solve it. Does the shaking stop when you stop, or does it continue? If it stops, it's either in the drivetrain or wheels. If it doesn't stop, engine or trans.
The obd light with tell specifically what it is, is it gas or rotten egg - the latter means catalytic converter, gas smell probably flooded or not firing on one or more cylinders, need more details. Also, if the light is flashing it's warning of catalytic damage - raw fuel hitting the cat, smell could be heat from cat trying to burn off raw fuel,it will glow red hot.
The sulfur smell is usually low grade gas or a problem with the catalytic converter. In your case I would go for bad gas, especially if the problem just started happening recently. You can try adding premium to the tank and drive it out. You may have to replace the fuel filter once or twice if the gas has water or other contamination.
if it shakes and smells of rotten eggs, then the catylitic convertor is bad. driveability symtoms are--- lack of power, drop in fuel economy, lack of high speed power, rough idle or stalling are the symtoms of excessive back pressure. due to a plugged up convertor. it should be diagnosed by a mechanic to verify this.
For the RPM's jumping up and down i would replace the throttle position sensor. If it smells like bad gas or rotten eggs these are signs that the cat. converter is going bad. For the poor gas mileage replace the fuel filter.