Illness Idioms

I woke up this morning with a terrible head cold. I’m now writing this lesson in bed surrounded by tissues and orange juice and I’m feeling very sorry for myself! So, why not write a lesson based on illness idioms, I thought...that will make me feel better! In the following idioms, which do you think is the correct missing word?
Lesson by Caroline

• 1. I feel absolutely terrible, as sick as a ___.
  
  monkey
  dog
  cat
  
  
• 2. Are you ok Alex? You look a bit under the ___.
  
  weather
  table
  rain
  
  
• 3. I felt awful yesterday, but today I feel as right as ___!
  
  weather
  thunder
  rain
  
  
• 4. She was off work for a while, but now she's back on her ___.
  
  legs
  feet
  hands
  
  
• 5. She isn't sick; she's just a bit ___ down. I think she needs to take a holiday.
  
  walked
  jogged
  run
  
  
• 6. Yesterday, I had a ___ headache. I had to lie down and close my eyes.
  
  breaking
  cracking
  splitting
  
  
• 7. If you want to do the three peaks challenge where you climb three mountains in 24 hours, you have to be as fit as a ___.
  
  cello
  fiddle
  violin