Probably the mindset you had, what you were thinking just before you walked into your room contributed to being scared of the drawing. Maybe you had a dream you didn't remember that was triggered by the drawing. Continuing to "live" makes it amusing, for me to read your little story at least (how could one "avoid" a picture as if it's real?) and the whole episode just takes on a bizarre, "why'd I do that?" kind of surreal feeling. I don't know about the "chewing on it" part though! Are you in the habit of chewing on things? There seems to be a lot of symbolism going on but that's personal to you, so I can't comment.