Putting Two And Two Together

My hand is hurting again -- right hand, at the base, right on the thumb side.  I was wondering why I've been getting shooting pain there all night, and then I realized that I used a knife to eat an andouille sausage tonight/Sunday night.  I have the same damn pain after I cut open packages of piss at work.  So the muscles I use when I use a knife hurt whether I'm cutting open packages or cutting through a sausage.

Which means ... well, I shouldn't use a knife anymore.  Man, it hurts!