If you mom is away, you need to prove you can handle this yourself. And though your options are few, you can show maturity by doing what is necessary to protect yourself.
I don't know what state you live in, but most places I'm aware of are particularly focused on protection of children and teenagers. If the first cop won't listen, tell your school guidance counselor. Call CPS. I'll be surprised if it takes you more than 20 minutes to get results.
'Cause if what you say is true, the last things you need to worry about are your mom and your ADHD meds.