I know how tough it can be but it seems like you're not getting the right dose. In fact, the depression and the weight gain are 2 indicators of that. The first months are the worse as a good doctor will try different doses until you get the right one and in the meantime, yes, you gain weight plus other symptoms such as acute fatigue and chills. But when you finally get the right dose you should get back to a normal, functioning metabolism. Unfortunately doctors here in Qatar are not, by any chance, the best in the world and have little care for patients...that's why most expats seek medical treatments in their home countries ;-)