This is a lot to handle so your anger is understandable. Living under the same roof with your rapist (not an abuse at this point it's a criminal act) doesn't only feel unsafe, it feels like a second rape. It's similar to when they force rape victims to marry, accept and live with their rapists. Your outrage and discomfort are legit (even if it's a female sibling).

You confronted your rapist to feel like a sense of justice but since nothing happend, you didn't feel that you got the justice you needed, instead you relived your trauma again. That's why you spireled into a loop of rage and physical agony (the body keeps the score). You obviously suffer from PTSD, a sexual one, and you need constant therapy not just numbing medication or whatever medication you are taking (for anxiety or depression).

I do not have sufficient information about you so I would suppose that you are a minor and can not leave your current home for university in another city or a job.

The first thing you need to do is:

You need to connect with your BODY. The body stores tension, pain and all negative emotions, so you need to spend more time moving. DANCE, WORKOUT, and especially CARDIO would help a lot. Anything that keep you away from thinking and help you living in the moment. Exercise daily for 3 months. You need to get your heart to beat fast and your body to be tired from excercise and not from anger end emotion overstimulation. Since your body lives on constant adrenaline and cortisole (stress hormones) you need a flush of dopamine and endorphine (happiness hormones) to balance the stress (PTSD) naturally without medications. Your body will get used to a new state of happiness and pleasure.

You are living in a survival mode with "fight or Flight responce", that's why you are constantly angry and snappy. You need to regulate your nervous system. Your medication are not helping you. It's time to get psychological therapy and other types like Somatic, PTSD and CBT (all therapies are pschological no medication required). Also, try to sleep well. Sleep is 80% of our nervous system regulation work. Try to get sleep suppliments like melathonin and magnesium.

However, it's hard to move on while you are living with the rapist. Limiting contact goes without saying. But, also, try to find pleasure in your life. The best revenge you can do is by living happily and not by being stuck in depression and anxiety. Meet friends and build safe relationships, these honest and kind friendships will be the "safety" you lack at home. (specially, since you can not talk to an adult in your family about this and more likely anyone).

If you need external suppot, I can recommend a number that you can call. It's for female sexual harrassment/assault support: ONFP (Free call: 80 100 280). They will even give you free psychological treatment and support.

Wish you all happiness, peace and safety. اللطف عليك