Hearing and smelling things not there

It's not that frequent- about every other day. I hear my name being called in quiet places, and nobody else hears it. The voice is never the same- it goes from raspy to melodic to whispered. I also hear a bell loud and clear, but it isn't the school bell and nobody else seems to hear it.
The smells are nasty, and bland- urine, vomit, something burning- and nobody else smells them. I get these every day in flashes. They last for a couple of second before going away.
It's been like this for a few months. I've been afraid to tell someone. It's beginning to scare me- the sounds are becoming more frequent. I've been getting more painful headaches than usual, too- but they don't last as long as they usually do.
Help? I'm 14.

While I do believe in the supernatural, I'm also married to a nurse.

What you have sounds *a lot* like you're having mini-strokes, or some other medical issue within your head. It definitely sounds like something you want to see a doctor about. It sounds like there's something wrong with the nerves and they're firing wrong.

It could be a ghost or medical... It might be a serious illness get help unless you want to live your life in terror

Tell your parents and see if they can't get you to a doctor to see what's going on. Don't be afraid to ask for help. Not doing so could be very dangerous.

Your spirit guides,angels and animal spirits are trying to get your attention. There is something in your life that you need to take notice,good or bad. The spirits could even be relatives that have passed and they see you going down a path you shouldn't be. It is a warning and you really should stop and pay attention,

To hear a bell represents a warning a ringing bell could also be a new beginning. If the bell rings and never stops your experiencing extreme anxiety.