Can A Negative Energy Follow You?

I live on the east coast of Canada. There's an island just outside the city I live in. It's called Partrige Island. It's not entirely safe, or legal to walk the stone break water path across but I think that's some of its attraction. That and the history behind the place. When people got the plague or something like that they used it as a quarentine center and dug a bunch of mass graves. My friends were going and invited me along. Almost everyone I know has went so I felt like I had to go too, and I wanted to. I was curious. I've heard about the underground tunnels and the art work painted on the ruins. I mentioned about going the day before I went to my parents to see if they had before but they hadn't. And didn't want me to either. They called it diseased which I guess is fair, but I didn't so much agree with or listen to their superstitious rant. I already had my heart set on going. And I thought I knew better. The island was one of the most beautiful places I've ever seen. There was a meadow with pretty pink flowers all around and butterflies everywhere. It was amazing how many, especially over the gravesite. My friend and I made flower crowns and it felt like a place of magic. The energy was incredible. In the daylight it was perfect enough to forget all the evil that ever happened where we stood. As a soviner we all grabbed little rocks to bring home with us from the island. That was 2 or 3 years ago. Today I suffer from sleep paralysis and maybe just really bad luck and paranoia but it feels like more. Something dark feels like it's followed. I never felt like this before I went there. I tried telling my psychiatrist but the most I've gotten out of that was some pills. Can bad omens, or a negative presence, interfere in your life? Can it follow you or am I crazy? I just can't shake the feeling there's something there. And I've tried sage burning but is there more? If anyone knows anything else or what I could be experiencing please, please help.