First we need to see the reasons behind your clenching of teeth. Be conscious for yourself and try to resist it as much you can control.
Next, consult a dentist so that you can get a night guard fabricated for yourself asap, so that no more damage occurs to your teeth.
After that you can get a full mouth rehabilitation done to get your normal facial form back to an extent.
Next Steps
consult a dentist asap
Health Tips
Try to reduce stress as much as possible