Weird feelings and worriedness

New to this kind of thing and started doing a lot of reading to start a book of shadows/ magikal journal/etc
This is my first official step into this thing as i plan to write things down before i start to practice it..anyways 
Once I started on making it, writing and such, the lights dimmed, never seen that before, i started hearing noises, and there was nothing there, and feeling like something following me, it feels kind of intense/heavy and is actually starting to make me feel uneasy, is this normal? Did I do something wrong?