Best antidepressant for insomnia that doesn't make your appetite go through the roof..?

Hi..

I'm currently on 30mg of Mitrazepine - mainly for very bad insomnia. I starve myself all day every day and am still putting on weight. Can't stand to look at myself in the mirror. Had the same happen in the past with amitriptyline ( but at least that one made me fat and happy, and not fat and miserable to hell - which is what's happening with Mitrazapine). Tried Trazodone some years back and had a horrific reaction to it - sick to my stomach to the point of not being able to eat at all, horrific nightmares, brain 'zaps' etc...

Does anyone have any suggestions for an antidepressant that'll help with very severe insomnia without the side effect of weight gain? Neither sleeping pills nor benzos work anymore - been there, done that, for over 10 years - nothing works long term.. 

Thanks everyone. Also sorry that I'm not helping anyone on here, just posting my self-indulgent c**p without giving anything back..