Sorry this is so long!!

I need to gain weight! I'm almost 25 years old and only weigh 90 lbs. I was in a very abusive relationship for almost 6 years and lost a ton of weight I guess from being stressed and depressed. I finally left that relationship and stayed single for a while until I met my boyfriend now of 2 years. He was like a dream come true. Not only did he choose to love me, but my daughter as well. He treats her as if she's his own, it's so precious! But anyway, since leaving my last relationship I have been trying to gain weight and it's just not happening! I tried eating more and eating things that were fatty, but I'm still a tiny toothpick! And I hate it! I go to my daughters school to pick her up and people just stare.. It drives me crazy!! Do anyway, if anyone has some good tips on how to gain weight, please feel free to drop a comment! Thanks in advance!! :)