Hi, i need advice on how to stop being so anxious staying home alone, for context, i'm 19 and dropped out of highschool when i was 16 due to being unable to cope with living with schizophrenia and severe anxiety so i pretty much spent 3 years as a shut-in going out 2 times a month at most and with a translator job online. My parents bought a place that is 4-5 hours away and they've been spending a lot of time cleaning and renewing the place so i'm staying alone. When it's getting past 6pm i get this overwhelming anxiety that someone might break in into my home and murder me, i check the security cameras at least 20 times a day, every little sound i hear makes me scared and nauseous, i cannot get myself to fall asleep and stay awake up to 28 hours at a time, my old brother checks up on me during lunch and that's the only time i see someone all day because he's really busy. 

I know i overthink a lot but it's one of those "what if" situations that drive me insane, any advice?