I used a prescription med my OBGYN recommended Phen-Pro. I was on it for six months nearly two years ago. When I was strict on my diet and exercise I was loosing 7lbs per week. When I threw watching my food out the window, I was still loosing a pound a week.
I loved it. Didn't feel weird. Didn't make my stomach hurt, or heart race. Cried the day I had to give it up (and my OBGYN), when my work insurance changed.
One problem, a little pricey, my PPO didn't cover the full amount (had to pay half, $75/month) of the phentermine.
Talk to your doctor about it.