Third eye opening w/ bad effect?

A psychiatrist would be a good place to start, since people come to them all the time with these sorts of problems. No use driving yourself insane with these visions or perceptions, if you don't want them. A psychiatrist is the best route to take. There are few guidelines when it comes to this sort of thing, but foremost among them is "follow your instincts." If you don't like the direction this third-eye stuff is heading in, get out fast. There are dangers in the spiritual world just as there are in the physical world.