Minocycline Hydrochloride and weight gain

I am taking 100mg 2x a day of Minocycline to treat my acne. About 2 weeks after the start of this medication, I gained 10 pounds virtually overnight. I know it was that fast because I see a weight loss doctor weekly and I'm on a very precise diet and exercise plan and it I was fine until about day 14. I went to bed the night before and woke up the next morning with an additional 10 lbs. Right now, I've been taking it for about 6 weeks and have managed to keep the weight gain to a minimum average a week by adding additional workouts to my regimen for a total gain of 14 lbs. Although it's treating the acne very well, the money I've spent to lose 53 lbs over the course of a year just to turn around and gain 14 in a matter of weeks is extremely frustrating. I did not have this side effect with Doxcy, but sun exposure was causing severe burns so we switched meds.
When I return to the doctor in a couple of weeks, I will see if there is an alternative solution.