Eating issues .

My husband called me fat the other day and he knows I've been having issues with my eating habits as I feel fat and disgusting after my child. My dr informed me that I'm actually underweight but when I see myself all I see is chubby flabby face and tummy and thighs and now hearing that from my husband during an argument has worsen it. 
I tend to starve myself or only eat salmon  and my husband makes fun of me for it. 
I'm 159cms tall and I weigh 50kgs
So I think in American way it's something like 
5'2 and 110pounds