Cheri -

I have the exact same problem - but it started before I got my bike - but it has been aggravated with the bike - and now I have it in my other hand too - I do what Kano suggested because it feels so much better - I've also ordered new grips for my handlebars that are for smaller hands - I just had x-rays taken of my hands to see if there is something going on there. Hope you find out what it is - I'd be curious to know... good luck