If you no longer want the spiritual gifts that God has given you....you can always ask that God take them back.
There is a reason you accepted this gift. It is detrimental to your incarnation and life experience. (not to mention those around you.)
What's got you asking this question in the first place?
Here is where I feel compelled to inform you that if you were one of those clairvoyants that think you can commit suicide to escape it....you will just re-incarnate under similar circumstances and have to live a life as clairvoyant again..and again and again until you do accept it and get it right...and learn whatever it is you are required to learn from the experience.
(You already have X amount of years invested in it...no since having to start all over, right?)
I hope that you are able to live with your gift and learn from it and guide others with it.
Blessings,
Rebecca