Dear Karen,
Having 3 sisters myself and knowing how much they mean to mean, I can understand that you feel devastated that you have lost your only sister. From the little bit you shared about her, I guess that the relationship with her may have been complicated at times due to her mental health issues and struggles with alcohol. Did you have a chance to say goodbye to her or was her death sudden and unexpected? You are still in the early days of grief, when your emotions can be all over the place. Sleep problems is something many people on this site have mentioned. Lack of sleep can make it so much harder to deal with things. There is lots of advice on websites such as NHS and Mind on what you can do to improve your sleep, so you may find some ideas there to try. Sometimes it can help to talk about how you feel with someone outside your circle of friends or family. Cruse is one of the organisations you ould contact. There is an article ontheir site about sibling loss that you may find helpful: https://www.cruse.org.uk/understanding-grief/grief-experiences/losing-a-sibling/
It is good that you have come to this site. I hope that by reading other people’s post and replies you will find some comfort, knowing you are not alone. Take care. xx Jo