Tolerance can occur with klonopin, but not in the short time you've been on it. It is also usually dosed twice a day. If you're getting anxious again, it may be the klonopin just isn't working for you. If you do 1mg, you want to do it twice a day, but that's about as much as you'll want to take on a regular basis. More likely, the Cymbalta isn't working on your anxiety, and may even be increasing it, as it works on norepinephrine as well as serotonin.