Best medicine and all that.

[shootingstar]

(William and Martin talking about the past, about their youth)
Soon, both of them are fighting for breath, holding their stomachs. Martin's face in laughter timeless and William feels thirteen again; the same boy, but this time, free.
The shriek of the trolley wheels in the corridor brings them back to themselves, their bodies relaxed, their faces aching.
'God, that feels good!' William says eventually. ''I never thought, in a million years, I'd be able to laugh about that.' He inhales deeply. 'I feel cleaned out.'
Martin nods. 'Best medicine and all that.'

(From A Terrible Kindness by Jo Browning Wroe, Part IV Midnight Choir, scene 58)

What does "and all that" mean here? Does it mean something like "to coin a phrase" and "as the phrase goes"?

 

[SoothingDave]

She's alluding to the adage "laughter is the best medicine."

It's Biblical.

Proverbs 17:22 says, “Laughter is like taking a good medicine.”

 

[shootingstar]

Thank you. Why are you saying "She's alluding"; it's Martin who is speaking? I think you mean the author.
When you are saying "He (She) is alluding to the adage "laughter is the best medicine"

She's alluding to the adage "laughter is the best medicine."

, this means Martin isn't really saying the proverb. So, my idea is "and all that" could mean "and whathaveyou" in this context.

 

[SoothingDave]

Yes, "he." And yes, you could understand "and all that" to mean "and what have you."