The man fell ill last winter and has not recovered yet.
feel on top of the world– feel very healthy
I have been feeling on top of the world since I quit my job.
flare up
– to begin again suddenly (illness etc.)
My mother’s skin problems flared up when she started to use the new laundry soap.
flare-up
– a sudden worsening of a health condition
His arthritus usually flares up every winter.
go under the knife
– be operated on in surgery
His wife went under the knife at the hospital last evening.
hang out one’s shingle
– give public notice of the opening of a doctor’s office etc.
The doctor decided to hang out his shingle as soon as he finished medical school.
have a physical (examination)
– get a medical check-up
Our company sent all the employees to have a physical last week.
head shrinker
– a psychiatrist
The man was told to go and see a head shrinker after he threatened the woman in the store several times.
just what the doctor ordered
– exactly what is needed or wanted
A nice hot bath was just what the doctor ordered.