First off, I'm obsessed with your username. Luna has always been one of my favorite characters. Second to Bellatrix Lestrange, of course.
I think that, as others said, you'll find more support than you think. If this came up with one of my sisters (knock on wood), I can pretty much assure you that I'd do whatever she needed to help her recover-whether she needed rides across town to see specific doctors, time to sit and talk or a chance to get away from campus for a bit. She's my
sister, after all, and I want nothing but the best for the entire chapter.
While there will always be girls who will seem indifferent (they're probably just unsure), there will also always be girls who want to give you a hug, make a giant mug of hot chocolate and watch
Elf for the gazillionth time.
I'm not advising you to jump up at chapter and tell everyone about it; I AM, however, encouraging you to stop keeping it so under wraps, because you never know what you'll find.
And also, I doubt your pledge class views you as a nuisance. I bet they just don't feel that it's as easy to reach out to you. I know this probably isn't what you feel like doing, but try reaching out to a few of them in a smaller group and see if you can grab lunch with one or two girls. Branch out from there.
I just want to throw out one last thing: since you know who your rapist is, if you feel comfortable, I think you could derive a lot of benefit from following DubaiSis's advice and filing a police report.
I am always here to listen if you want to talk about anything.
Sending ((((((((((hugs)))))))))) and lots of love. <3