Really worried about my Grandmother

MY GRANDMOTHER IS LIKE MY MOTHER! (dad’s mother) she’s been living with us before I was born, and this year she moved out (she didn’t want to) but she had to, any way, right now she’s in the hospital, and I’m REALLY worried about her, (my aunt_her daughter_was there all the time) but still, I spent 3 nights with her in the hospital, I took her to the bathroom, changed her clothes/diapers, made her tea/coffee, helped her while she’s eating, I did everything just to make her feel comfertable,and to make her feel that I will help her and I won’t leave her alone, she’s used to me, and I’m the only one who really cares about her compairing to all my cousins, I cried a lot, and right now I’m home again cause I have to study for the final exams, but I told dad to promise me to take me to her everyday, and he will take me there everyday, my aunt is REALLY tired, I made my aunt laugh, and I made my grandmother comfertable, but I have no idea WHAT to do if she dies! I will not talk for months/years, she’s really close to my heart, if she dies I’m going to feel like I lost a piece of my heart, I truly love her, and I want my family to undestand that she needs their help and support, I’m not enough, I was the one nagging on her to drink 4 bottles of the medecine she should drink, I was the one who called the nurses and helped them out, I was the one who spent the 3 nights with her, I was the one who cried and felt her pain, I was the one translating english to turkish for my aunt and grandmother to understand what the nurses are saying, I understand that my aunt’s tired, but what if I didn’t spend the 3 nights?! she could’ve been dead by now!!! now that I’m home, I can’t sleep, I keep thinking about her the whole time, how do I forget her? I really want to sleep but I just keep crying! right now while I’m typing this whole question I’m crying, I have to stop crying so I can be able to sleep, and I stop crying I will still think about her, I can’t think of anything else!! HELP?!! how do I convince myself that she’s GREAT right now?