I think it depends on what your doctor thinks you 'need'. Have you got enough essential body fat? Or do you need to put on muscle? I think you should find out first whether he wants you to put on fat or muscle. Because the more muscles you have, the more fat you burn.... So if you have low body fat count and you put on even more muscle, it could burn the last essential fats away. DTMS? Maybe eat more carbs? My best friend has struggled with her weight for quite some time (but she was anorexic, i.e. the actual condition, she struggled mentally a lot as well). If you want to, I can ask her what she did to put some weight on! Otherwise I can't help much, sorry.