"i have been taking belviq now for 9 days.  i started off at 235 now i am at 228.  i get headaches every now and then, i am really thirsty and my back hurt yesterday for about an hour.  i sleep all night, but it feels more like i am blacked out, or maybe just sleeping harder than usual.  i am focused more and have more energy to get things done.  so far so good, let&#039;s see how it works next week."