There is Hope for Haiti
Visit them at http://www.hopeforhaiti.com/volunteering.php
to inquire about help,
There is Red Cross, you have to contact your local chapter.
There is Nurses International, or Nurses without Borders, that you can contact.
Be patient, they will surely accept your help, but you may have to go through a rush training course/temporary certification in order to go, plus traveling internationally is always a lengthy process, unfortunately. I'm sure they are trying to get the help there as quickly as possible.
Help IS on the way, but Haiti is very far away, and parts of it are unreachable. Teams from ALL over the world, China, Denmark, USA, Britain.....everyone is coming to help.