antidepressants

I have been taking 50mg (sometimes 75mg) of trazdone as a sleep aid for about six months now ( it does help). Although I do have some side effects from it, mostly (fatigue, aches and weight gain (30lb)). I get penalty of exercise by walking and riding my bike most day a week. The doctor put me on a strict diet (drinking 2 shakes a day and a healthy meal at dinner) but I have not lost a pound (on diet 3-months). With no success with my weights loss or the fatigue feeling, he prescribed wellbutrin Xl (not started yet) to counter these side effects, he said it might help me lose weight and gain energy. I am now worried about more side effects and actually becoming depressed, or worse having suicidal thoughts because I will be taking two antidepressants. I am at a loss on what to do and was wondering if anyone else has had these issues with trazdone and if anyone has been giving welbutrin to help counter side effects. Thanks you