I need help gaining weight..

I’m 23f and I have always been about 115 lbs & 140lbs at my heaviest when I was pregnant with my baby. But I have since lost my baby weight and can’t seem to gain it back. I used to work out in high school and I was about 125-130ish then but I have a high metabolism and can’t seem to keep any weight on. I just want to feel healthy and happy with my body and myself but I have a terrible eating disorder and what I think it’s more a mentality issue but I don’t know how to get myself to eat more. I’m very picky and almost have pregnancy cravings in a way but it’s more or less safe foods that I keep eating and then will get sick of after a while. I need help and I don’t know where to start. Any advice or help would be amazing 🫶🏼