My little sister has bad period cramp, help?

Anonymous
I'm 23 year old guy and my little sister is 15. I have a twin brother as well as an 18 year old brother and our parents died 2 years ago so we've been raising our youngest siblings. My sister started her period when she was 11 (even when our parents were alive we've always been very close so she told me and my brother when she'd started). When our parents died my little sister became very stressed as you can imagine since she was only 13 and me and my twin have had to become mother, father, brother and best friend at the age of 21. When she got her period the month after they died it was very painful but it was manageable with pain medication. Now it's so painful that even medication isn't working and now she's in our bedroom crying her eyes out about it. My twin has tried rubbing her back, getting her hot chocolate, hot water bottle, hugging her and putting on a film. I've never seen her like this in a long time and my 18 year old brother is getting scared about it because she's so upset. We love our sister to pieces and we don't want to see her so hurt. Is it stress that is making it so painful? What can we do for the mean time just so that she'll sleep? Thanks.
My little sister has bad period cramp, help?
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