Read this article: http://www.sheldonbrown.com/tooltips/hubs.html, or this one: http://parktool.com/repair/readhowto.asp?id=105

It explains how to repack and overhaul hubs. Read it completely and make sure you have the right tools. In the future, have SOME IDEA of WHAT you're tightening, before you tighten it. You may have ruined your hub completely if you tried to ride on that completely bound-up hub too much. Hopefully not...