I am terrified being left home alone

I love alone time or doing solo activities but being physically alone gives me such bad anxiety it honestly crippling. I was left home alone for 30ish minutes today and I honestly couldn't stopping thinking over and over again that there was someone in my house, specially a large man, and that I was in immediate danger. I sat in my bed trying to make as little noise as possible because than I would be safe, I'm not sure if it was a panic attack or something but my heart was going super fast and although a part of me understood I was safe my body was in a petrified state and I couldn't really move. This isn't the first time this had happened although it's not always this bad.

My uncle has OCD and for the past few years my grandma and him have been pretty convinced I should get tested but idk. Does this sound like OCD or just general anxiety??

Sorry for spelling errors, I have dyslexia.