Does Remeron (mirtazapine) cause weight gain?

Hello, I have been suffering from recurrent severe depression and generalized anxiety with panic attacks and difficulty sleeping for over 7 years. Recently, I was also diagnosed with a borderline disorder. I was prescribed Remeron but was really freaked out by the idea that this medication could make me gain a lot of weight. I have tried a few other medications before, mainly Seroquel (lots of side effects) and Cipralex (didn't seem to work at all). Could there be an alternative considering the fact that I tend to get very bad side effects very easily? Thank you for your help!