No One Lives Here Anymore

It's my house, I've been living here for 7 years now and never have I felt scared anxious or freaked out, not once. It's the same house I look at in pictures and in home videos. What's changed? But a couple of nights ago when I went on the roof for a bit I actually got shivers and goosebumps as if I had a premonition of something really really bad. What something? I'm not quite sure of that but it was scary and I wished I could have just ran away. This feeling of intense fear and dread spread over me as easily as the cool night air rustled the branches of the neem tree across the street. It seemed as if something evil was watching me, waiting for the perfect moment to strike, waiting for me to lose my guard and then it would pounce, attacking my very being and all those that are important to me. And all this happened within a span of a few seconds. My mind visualized all these gruesome and horrid images so fluidly as if they once truly did happen right before my eyes. You can be sure i ran downstairs in a panic but not before slamming the roof's metal door to scare away whatever evil lurked near my house. What was that? Why did my mind show me such horrible things? Will I really lose the people I care about? What's wrong? It's as if it's just me now and no one lives here anymore....