Type 2 and Mirtazipine?

Hi all. I'm not newly diagnosed, one year now but was diagnosed after an accident where I severely damaged my right leg resulting in being hospitalised and bed bound for a long time. I was in Hospital and bed bound for nearly three months with no exercise at all and was only prescribed Metformin 2 months after being diagnosed. it was 5 months before my first Diabetic appointment with the nurse at my gp practice and when weighed we discovered I had lost around 2 and a half stone. My job before the accident was as a Bar manager and as such I was constantly on my feet and I admit that my diet was shocking but I was really shocked at how much I had lost. Before the accident I fluctuated between 20 and 21 stone! I was now 17 and a half.
I was then prescribed Mirtazipine for my depression which had hit hard due to the accident and all the stress it had caused. Immediately my weight began to go back on so I stopped the mirtazipine and went on amitryptiline instead. This seemed to help but I have been put back on Mirtazipine again and my weight has shot up again. I am still unable to work or walk properly so excercise is difficult but I do what I can
Has anybody else has a similar experience or have any advice about this? I have spent the last year focusing on my injury and just eating healthily but my levels have shot up and I'm due more surgery on my leg and just finding it hard to control my diabetes. I'm on two metformin twice a day now but even this doesn't seem to be controlling my long term levels.
any advice would be greatly appreciated.
cheers

Thanks.
It's mainly been lots of fresh veg, Salads and soups. Wholemeal Bread etc. Watching the Portions of Potatoes and pasta and rice. Sometimes none with evening meal. A few biscuits occasionally. I cook as often as possible as it's my happy place so I do think about each meal a lot. Never really tried Diets. I shall have a look.Thanks Ethyl.