Here's my advice...
You could have called an ambulance for your wife, claim she was giddy and have her hitch a ride to the nearest hospital for treatment. Hospitals usually treat patients brought in from ambulances with higher priority.
Any medical leave of 3 days or more is enough to start a police investigation and if it's 5 days or more, it usually constitute a more serious offense (grievous hurt). Medical or hospitalization leave does make a difference.
Ensure you have the names and division/branch those police officers are from as you'll need to formalize your complain in a report and having the officers names would mean you'll have that of the complainant - in this case, the Korean lady. But do ensure the officers take down details too. Don't assume they would.
Assuming you've got your hospitalization leave, police reports and the complainant is identified. Police investigations would take up to a year if you harass your investigation officer (IO) enough. A magistrate's complain would help, and if you're pissed enough, you could file private summons.
You need not engage a lawyer, but it does help if your time constrained and are willing to compensate time with cash.
Hope it helps.