Two months won't yield significant tolerance. And in case you're wondering, tolerance to the anxiolytic effect develops only a bit. You may have to raise your dose, but it shouldn't be by much.
You're right on the money brother. If you abuse them they'll abuse thou, if you're taking them honestly under doctors orders and aren't taking more than you need they're one of if not the best class of medications out there for irrational obsessions (anxiety, panic, ocd) and intrusive thoughts.