Christmas VT puzzle

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Across
  1. 4. Relate to vision
  2. 5. You don't want to grow one
  3. 7. Reindeer or Dr Suda's dog
  4. 9. Abnormal rhythm
  5. 12. Speedy rate
  6. 13. Comes before a big one
  7. 15. Part of a face or gun
  8. 17. You don't want to breathe this
  9. 18. Special holiday saying
Down
  1. 1. What is methimazole used for?
  2. 2. Heart medication
  3. 3. Famous snowman
  4. 6. Swollen stomach
  5. 8. Who gives Fido gifts?
  6. 10. Dr Thompsons dog
  7. 11. Curb your enthusiasm
  8. 14. You might find it on a shelf
  9. 16. Where food goes down