Interesting you should bring this up, Wishy.
My pcp just prescribed diet pills for me a few weeks ago, because I'm at high risk for heart disease, and a bunch of other cardiovascular stuff. They work well enough, I lost 11 lbs in 2 weeks.
I don't like the side effects though. All of sudden, I can't even finish a meal, have no appetite, and my libido's slipping. I used to require a minimum of 2 orgasms a day, now it's like 1 every other day.

However, I continue to take them because I do care for my health.
These definitely work, but they're prescription meaning you have to be overweight to get them.
I wouldn't recommend messing around with any diet pills at your weight (from what I recall you're only 7 stone or so). Wait until you get on T, it'll redistribute your body fat. Although that 'puppy look' does sound adorable!