Lexapro is in a class of drugs called SSRI's - Selective Serotonin Reuptake Inhibitors. There are several drugs in the class from Prozac to Zoloft, Effexor XR, etc.
Lexapro is a next generation drug of an older medication called Celexa. Both are generally weaker than some of the others.
Every person will respond differently to different medications. The FDA requires the manufacturer (Forest Labs) to include all side effects that occur in more than 2% of the population in their package insert. But, it doesn't mean you'll experience any of them or that you won't have one that's unique to you. Here's their full prescribing information (clinical document intended for pharmacists/physicians): http://www.frx.com/pi/lexapro_pi.pdf
Adverse reactions (side effects) are on page 10
The reason people recommend not stopping cold turkey is that your body has an adjustment period to build up a therapeutic dose of the active ingredient. If you stop cold turkey, your body will basically go into withdrawal and will be dependent on the dose you take. You'll need to titrate down meaning you slowly wean yourself from it. The longest-acting of the products, Prozac, doesn't appear to need this as much.
If you have any questions, ask your pharmacist. They're likely to have had thousands of patients to whom they've dispensed medications in this class and can give you a more accurate idea of what to expect.
Good luck getting through this rough spot. I hope it's only temporary.