My sister is a problem

I’m pregnant with my second baby

And my sister pregnant with her first baby

I’m always sick I feel shit and depressed I don’t feel happy about been pregnant anymore I been in hospital 4 times because I throw up all day and don’t eat or drink much through the day I lost weight I was 61kg and been pregnant 13 weeks my weight now 50kg I had it hard my sister think I’m weak and don’t think positive and I’m negative person she told me if I’m negative why did I become pregnant at the first place I had a fight with her about the same problem and she still think I’m weak and negative person what should I do with her I had enough from her