Being alone when you aren't doing well is really tough I can imagine. Can you call/video chat with your parents or a friend to make you feel less alone? I like using the website Rabb.it and watching movies/shows while video chatting with friends who are far away (I moved away from my friends for grad school and live alone). Listening to podcasts while doing other things distract me and I enjoy listening to the person talking so I feel less isolated. This helps me. That being said, I have never had the problem of hallucinating so don't know if it would be helpful for that. Perhaps talk to your parents for the future that your little brother maybe isn't able to provide you the help you need when they are away. If there is no option of friends or other family I understand that might be difficult.