You've put the fishing line out, now sit back and wait for the fish to bite.
If he's any type of a gentleman/doctor with ethics you won't hear from him again. At least not for a year or so. Don't push him or force the issue. If you run into him with your charity work then so be it. Don't go chasing him though. See your GP for another referral. If needed contact his reception staff to cancel the already booked operation - there is no need to contact him directly. Wait for the fishy.