Sisterly drama and I have potential health issues

I have known maybe for a week or longer that my sister has been seeing another guy other than D but my impression was that she told D that they were over and she didn't love him. I have known that D hasn't accepted that it's over. My sister still lives with D as they have a daughter but she came down to see S. I was then sworn not to talk to D because he'd be suspicious of her whereabouts. I do talk to D but I don't think it's a big deal because I didn't think he'd mention her but he does I regret not just listening to my sister and ignoring him. At first were talking about mushrooms (to D). Then he asks about my sister and what we're doing I told him I was watching Jason Bourne and giving my mum a massage. He doesn't buy that she's there because my sister is not answering the phone. He says in the group chat that I'm in with my sister, that she's a liar. Eh I think 2 or 3 hours past he sends a video of Alana crying she wants her mum but my sister is unreachable. I see the video on the chat and I tell my sister what's happening and that Alana wants her mum she's been crying. I send the videos of Alana crying that was sent to the chat via text message to my sister. I also say that he's been threatening to harm S if my sister didn't come. Something snapped in me seeing Alana cry that I tell the truth about what I know that my sister saw S. It would be something I regret later because I honestly thought D was bluffing when he said he'd harm S. I tell my sister that I tried holding Damien off and I gave a story about watching Jason Bourne but then he didn't buy it and after seeing Alana cry I spilt the beans. My sister says I should have just listened to her and ignored D but she realizes as well that her being unreachable to D arose suspicion. I am surprised that my sister isn't raging at me. About it all because in a way she told me to keep a secret and as much as I tried I still failed. Well anyway, I find out that D was serious about harming S so my sister had to uber her way home costing her $40. I tell my sister I thought he was bluffing she tells me "didn't I tell you the bus story". I then remembered that D punched a guy knocking him unconscious just because the other guy was trying to pick a fight. I say oh f I thought D changed that he would realise what he could lose. Well anyway, everything is okay but I feel bad because like now I just feel like it will be uncomfortable for her at home. I honestly cared more about my conscience then the fact that it could be bad for my sister and the guy she was seeing. I feel like I've been selfish telling Damien knowing now that he would have gone through with it and harm an innocent person. I know my sister is not mad at me but I feel like I no matter what I did I just would of felt like I made the wrong decision
Tbh sometimes I do feel like no matter what I chose it's not right anyway and I can't say why I feel this way. Now I know that my sister is saying D mental health isn't good and I know that my sister is on all these meds that give her Tarcarydia (fast heart rate). I'm concerned about my sister because I know that she's a health risk with all those meds. She told me she took a lot of prn but still didn't sleep well. Now I'm just praying that this thing can be talked about and sort through I am hopeful even though I do feel like my sister is not in a good place. I do believe in her and her ability to make her own life better I just don't see a way out of her taking all these medications especially when it's what the doctor wants. I feel like it's a hard place and I know that if they put her on lithium her thyroid dies she stays on what she's on there's a risk of heart damage etc. I don't know what is the good option for her and I am scared that these doctors just wanna drug her. I know she has bipolar but I don't think medication is the only route. She's said to mum she wants D to keep the house because she doesn't want to be there if he verbally abuses her over what she's done being with another guy. Christmas is a hard time of the year for us. I am sick with the flu and have terrible stench in my lower neither regions my lady bits. That my sister thinks it's symptomatic to precancer cells in my cervix. I know my sister had precancer cells in the cervix last year and my grandmother on my father's side died of cervical cancer so I am worried. The strange part is I hope I have the precancer because it means at least I can finally be treated and get rid of the stench. I'm going to talk about my concerns to the doctor and see what happens... Wish me good luck thanks for reading this long post.

I would like to read your post, but I can't because it's very hard on my eyes. I think a post may get more replies if it's broken into readable paragraphs.

I'm sorry you are in those situations you described. Pain in my hands prevents me from replying properly to your post but I hope things improve in all of those circumstances you wrote about.

I hope your hand pain improves! Hugs

I don't know if I can edit it now I tried editing but too summarise basically what is happening. Is I knew about my sister seeing another guy but she had always told me she told D they were over and she didn't love him. So I kept her secret but then spilled the beans when Alana was crying and my sister didnt answer. This could of ended up with S being bashed but D so I regret saying anything.