No appetite

I’ve struggled with depression for almost 10 years. When me and my boyfriend started dating I was the happiest I’d ever been. It was the best I’d ever felt about myself and I thought this was my time to finally be happy. I was gaining weight. Then out of nowhere he just didn’t want anything to do with me. Due to issues I have with being abandoned by my dad I took things extremely hard. I’m still not over it tbh. It really brought my self esteem down. I just feel like I’m never enough for anyone and I’ll never be enough. So while we were together my weight was at 115 and I was still gaining but now it’s at 102 and it keeps dropping everyday. I have no appetite. I can’t force myself to eat because it just makes me feel sick. I really don’t know what to do. I just need to know how to be at and stay at a healthy weight. Please help.