Hi,
It sounds like you are going through a lot, to say the least. It sucks to be in a bad situation that feels like it just keeps getting worse. I think the first thing you need to do (and I hope you already have) is to get some sleep. I know that might sound absurd, given the scope of everything you've shared here, but your body and your mind need rest. As someone who's dealt with nightmares most of my life, I know it's easier said than done, but sleep can make such a HUGE difference in how you feel and how clearly you can think. It's not going to fix everything, but it's a first step.
Next, try a breathing exercise. Again, this isn't going to fix everything. But it might help you calm down and clear your head, even if just a little. I like box breathing—breathe in to a count of four, hold for a count of four, breathe out for a count of four, and hold for a count of four. Repeat four times or so. (Stop if you get dizzy.) You can also try yoga or just going for a walk or listening to a guided meditation if you prefer.
Now, think about whether there's anyone professional you can reach out to for help. I know that might be daunting, especially when you've got so many things on your plate, but it really sounds like you're in a place where you could use some extra support—and it sounds like your friends and family might not be the best place to turn for that support at the moment. It's all too easy sometimes to always put others first, but if you don't take care of yourself, it's hard to be there for the people you love. And I'm sure you'd like your loved ones to take better care of themselves, too. So consider whether you can talk to a counselor (maybe your school or work has a free one you can talk to), or call up a doctor, or connect with a therapist—if not in person, maybe online or by telephone. If you don't know where to start, try a hotline—we have several listed here:
https://www.healthyplace.com/other-info/resources/mental-health-hotline-numbers-and-refer…
Even if you don't want to see a doctor yet, you might try connecting with a support group or even just finding some self-help materials to start with. Again, that page is a good place to start looking.
I hope you and your loved ones are able to start healing sooner, rather than later, and I hope this information helps you do so. If you need more clarification or have any other questions or concerns, just ask. I'll be around.
Sincerely,
Kim