(Concern) Amenorrhea issue

My period stopped since October last year, and I haven't heard anything since then. I did lose some weight suddenly, but I thought it was okay, so I didn't pay much attention. However, as the duration lengthened, I became worried and started visiting an obstetrician-gynecologist, eventually going to a university hospital. They did various tests, but there was no significant abnormality. I was prescribed hormone medication, but I am hesitant to take it because I had side effects when I took a different type before. I am struggling with this.ㅠㅠㅠ It feels like premenstrual syndrome, with mood swings and a sudden increase in appetite. Since I haven't had my period for so long, I think I should take the medication, but I really don't want to take it... What should I do?ㅠㅠㅠ