Sounds awful waves.
Try the bandaid trick.
Another distraction is rubber bands around the wrist.
This will probably sound strange, but if you catch yourself biting you can ping the rubber band. It will change the pattern of the biting after you've done it over time. You don't need to hurt yourself with the rubber band pinging, just fairly gently. It's like side tracking a circuit.

p.s. long past my bed time here.
I wish you all the best with putting up your dose of the Lexapro.
I hope you have a much better day and that things will improve for you.

night.