iso any tips for trying to gain weight?!

Hi, im 120 lbs, 5 ft 4in. i chase a toddler around all day. and when i say chase i mean Running... like a chicken with its head cut off

ive always struggled with gaining weight. i had an eating disorder from freshman year that lasted until 3 months before i got pregnant( 5 years roughly) . i loose weight like crazy when i get stressed even the slightest amount. im high anxiety and am starting medication to help with it soon. i am very anemic. i take molasses for my iron and eat red meat once a day. i just dont know what to do. im stressing out feeling scrawny and i can barely look in the mirror without seeing myself as disgusting. i love my life but i would just love to be able to live it and feel comfortable in my own skin. any advice?