Hey, I just thought I'd point out that, at least in my part of the world, psychologists cannot prescribe medication. You need either a general practioner or a psychiatrist for that. My first two medications were prescribed by a GP, but after it started to seem like the second was not working, I saw a psychologist, who sent me to a psychiatrist so that they could assess me and prescribe me with something. I was taken off the medication I was taking and on to a new one, but they did not do much in the way of assessing, which annoyed me. It really bothers me and worries me that no one is willing to diagnose me. But that isn't the point.
My point is that the medication I'm on is frequently prescribed by GPs- my sister is one, and prescribes it often when its needed. I'd recomed trying it, and if it does not work, get a referrel to see a psychologist. If needed, they can refer you again from there to get a new prescription. Also keep in mind that it takes months to know if something is working or not. My current one is supposed to take a year. I also know that GPs do have to do some training in psychology, or at least, my sister did. It was not as much as a psychologist, but she had to do some subjects on it, and do a rotation in a psychiatric ward. This may vary a little from country to country, but your doctor (hopefully) is qualified to prescribe medication so it should be okay.
On the subject of sideaffects, you can probably search online for any side effects of the medication you were prescribed, if it doesn't tell you on (or on paper inside) the box. I've also found that it can help to ask a pharmacist. They know about side effects, and have fact sheets that they may be willing to provide a copy for you. Alternatively, you could go back to the doctor, or get a second oppinion from another doctor if you are really concerned.