elbow pain and hand palm numb

i ve experience some pain in my left elbow after my rides and also hand palm numb once and a while during my rides. the numbs disappear after i changed my position on the bars. usually have it if i put my hands on the hoods. sounds like bad riding position...
ride like the wind... with the wind... to the wind...
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As a general guide, if you can see the front hub when you're on the hoods, your stem is either too short or too long.
Failing that, relax your grip on the bars?
http://www.grabthehudz.com/products_shimano-da7900.html
2 versions I believe, one more aimed at to reduce vibration.
Also perhaps worth doing some upper body weights. Hope you find a solution!
Rides:
MTB - Giant 2008 Trance X2
Road - Giant 2010 Defy 2
Hybrid - Giant Escape 2011 City 2