Phentermine

I've been struggling with my weight as a teen. I became sick in high school, not eating. Got pregnant gained 60 lb 9 months. That puts me at 190. With depression and life I hit 230. Had a 2nd baby, but managed to maintain my weight under Dr's care. Last year I dropped to 195 with working out and calorie counting. Over the holidays I shot back up to 210. This winter was rather harsh so I wasn't hitting the gym either. Now, I'm calorie counting and met with a trainer so I'm back to the gym. But my body wasn't responding so dr put me on phentermine. I've lost the 10 I gained. In a month we're going to do a weight and med check. Any one else's experience with phentermine? Or thoughts?