Honestly, I mean you didn't say what your coil was prior to the drop, nor how many the volts was prior to the drop, but I assume dropping it changed both of those readings..
Between both of those readings being changed, as well as your now being unable to change your wattage at all, I would say it is now unsafe to operate.
Can you take the battery out of those things? If the battery is removable try removing the battery for a few minutes, then putting it back in and starting it up again.. if you do that and all your settings go back to normal, then I would use it til you got paid and get a back up on payday in case it starts acting up again..
But if it doesn't straighten that out, then get a new one and don't try and use it at all, because it's unsafe to use.
Your atomizer should be fine.. Just get a new mod.