It is a little frustrating planning your meals at first, but it will become second nature in no time
The doctor that diagnosed your PCOS should have some diet suggestions for you. As beerab mentioned, the South Beach Diet has been helpful to a lot of people with PCOS. It's a "good carb" diet so you cut out certain things you don't need, like sugar, and focus on more nutritious foods.
A very large study by a university showed that exercise was more beneficial to regulating PCOS than diet, so make sure you get moving as well
Regarding Lipotrim, it seems like a very difficult diet to stick to. A shake might be handy here and there if you don't have time for a meal, but not eating solid food can set you up for failure easier than it can result in success. If you choose to follow a diet like this, please make sure you see your doctor regularly for monitoring.