Likely
thyroid eye disease–related eyelid retraction (
TSH receptor Ab positive supports this even if T3/T4/TSH are normal).
For your event:
Botox is a reasonable temporary option to reduce lid retraction and improve symmetry. Onset is in a few days, but results are dose-dependent and can sometimes cause ptosis or asymmetry, so it should be done by an experienced oculoplastic surgeon.
Meanwhile, use frequent lubricants.
Next Steps
You should get an urgent oculoplastic evaluation for planning both short term and long term management