How Long Does It Take for Botox to Be Completely Gone?

It takes about 2 days for Botox to be taken up by the nerves that stimulate muscle movement. So, the Botox, itself, is gone, but you are still experiencing the effects of the muscle weakening.
These effects take, on average, about 3-4 months to disappear as new nerve endings grow to stimulate the muscle to move. You should notice gradual improvement over the next few months.
Unfourtunately, there is no injection available that can counteract the results.

Botox typically lasts for about 3-4 months. You might see results last longer if you've had many treatments performed before or if the area you have treated isn't moved a lot.  

Normally Botox is gone from your system after 5 months.  Each patient is a bit different so it's possible you are holding onto your results longer than average.

Unfortunately, there's no way to "reverse" a Botox injection so allowing the product to dissipate naturally is the only way for the effects to resolve.  Sorry, but in this situation, patience is key.  You should see the effects gone completely after 6-8 months.