Being skinny has me extremely depressed💔

I was never skinny and never had a tiny waist but my old body made me so confident. Today I found a picture where I was 60 pounds heavier now I'm at 100 and seeing my body and seeing how full I was and my bones wouldn't peak through made me cry. Ever since I got pregnant I lost so much weight and EVERYONE has something to say always about my weight now. It has made me extremely depressed to the point I feel so ugly to the point I even put myself down. To the point I've searched google and YouTube for things and everything to see how I can gain weight. This really has become a problem. It has been two years already.....

I'm desperate I need you guys to help me. 😔

If you care I'm 26 and I'm 5'5

Yes I've told my doctor and seems like she doesn't care. She says "it's better to be skinny then overweight" I feel she doesn't care to help me.