Sherlock is one of the most terrible patients John has ever had.
And that includes the recently widowed lady who always tried to get into his pants (much to the amusement of the nurses who said that he should be proud to be so popular with all generations), the old man who farted and giggled into his beard whenever he saw John, the young man who broke John’s wrist because he tried to take away his mobile (on the way to the A&E because he had a knife in his leg) and the neighbour’s cat that bit him more often than he could count.
Sherlock with a cold is whiny, demanding and sounds like he is about to drop dead any second. Sherlock with congestion? Oh boy. That just makes him curious and results in a series of experiments. We will not speak of it any further...
You would assume that being such a terrible patient, he also is a bad nurse. He is. But he tries so hard that John never wishes him to be different in that regard.
He tries, therefore John can forgive him for endless cups of cold tea, for disappearing while looking for painkillers and even for that one time when he flooded the bathroom because he forgot that he was running John a bath.