Unfortunately that is a pretty common ploy by self-proclaimed psychics that they use to try to milk more money from the customer. They tell you you have "bad energy", "blockage", a "curse" or something of the sort. The next step is usually that they will be glad to remove it from you for more money. More likely there is no such thing in your case.
But, if you think you might have some sort of "bad energy", one way to cleanse yourself is to bathe in salt water. Take a tablespoon of salt and add it to your bath. As your rinse the water over yourself feel it drawing all the negativity from you and then running down the drain.
If you shower rather than taking a tub bath you can accomplish the same thing by putting some salt in a bowl of water and then rinsing with it while you are showering.