I do not know how hallucinations you may have, but the bipolar group of the (1) and (II) varieties can really be amazing or terrifying. Or, just so what, there's a Hobbit in my underwear drawer, and yeah, he likes me, OK with that? Huh?
I am a not a doctor, but I do have some experience in the business, having been bipolar for a long time. And, now that Showtime's thriller program Homeland (and everyone' s favorite BP girl Claire Danes [as Carrie] was last seen running from an execution in Iran) has wrapped up its third season and our latest BP Disorder heroine in Black Box has just begun her show (with hallucinations, but only the patients so far), I wanted to contribute to the lull (hmmmm...) by sharing some of my favorite hallucinations of the past few years.
5) Radio KNUT - this one is the usual music from a distant radio. This is a more common hallucination, but mine comes normally when I'm in my house on colder days when the furnace comes on and the hot air swooshes through the grate. I am then entertained by voices and songs harmless, and in some cases, soothing. Occasionally, I make requests for some Tony Bennett, or Sinatra, but I'm not heard. More Glen Miller is all I get.
I look at it all like this, and part of my philosophy comes from some time spent with Buddhist teachers. From the site bipolar.about.com - Bipolar disorder is an illness that affects thoughts, feelings, perceptions and behavior ... even how a person feels physically. It's probably caused by electrical and chemical elements in the brain not functioning properly (see What Causes Bipolar Disorder? for more information), and is usually (but not always) found in people whose families have a history of one or more mental illnesses.
Look if you are hearing and seeing things that you don't recognize, you need to speak to a doctor. They may be able to help. I know what my hallucinations are. I do not fear them.