I would ease off with the gh if you're getting carpal tunnel like sides, then ramp up slowly. I've heard that once carpal tunnel develops it won't heal, you need an operation to fix it. Don't know if it's true or not but that's what a doc told me.
Keep it in the fridge. It's not like your gear is going to become instantly useless on the expiration date. It's obviously still potent if you're getting sides.