Mirtazapine weight gain side effect

Hello all,

I’ve been on Mirtazapine for four months (15mg) prescribed to me for depression and anxiety. I have always struggled with maintaining a desired weight but historically found it very easy to lose a stone before holidays through exercise and calorie counting. According to 6 years of logging into MyFitnessPal my trend it that I am around the 10 stone mark in winter and the 9 stone mark in the summer. Started Mirt in December, by January I was 10.5 stone - no problem, I will do more exercise and watch my eating. NOPE - literally had zero energy to go to the gym and my craving for carbs and chocolate far surpassed anything i have ever experienced. February - 11 stone - i have never been this heavy but its fine, its just another stone to lose. By this time i am religiously counting my calories (1500 max per day) and exercising and also doing intermittent fasting. Weighed myself last week and i am now 12 stone! how can this be? i really dont know what to do at this point and ironically the rapid weight gain is causing my depression to heighten. I have skipped my meds for the last two nights and feel no different - a little light headed but nothing that i cant handle.

Any advice please? x