I'm SUUUPER Paranoid

Okay. So, I've smoked weed before, but as of now I'm sober. Haven't smoked in weeks. The last two times I've been super hyper aware of my breathing and I'd get mad anxiety. That's why I haven't smoked in a while. But about 10 minutes ago I felt this sudden high come on. I have all the same symptoms that I get when I'm high; tunnel vision, cotton mouth, rapid heart beat. I'm freaking out. I feel high but I haven't done ANYTHING. What is going on?! Also, I'm on my period so maybe that has something to do with it. But it's freaking me out. And I'm alone right now. About an hour ago I heard a noise and got scared (slight anxiety). I'm thinking maybe that feeling triggered the "high". What is going on?