Having also been to Belgium numerous times, I’ve noticed that a large percentage of the folks there were foreign Muslims from North Africa, Turkey and other exotic venues. It is quite possible this “Doctor” was one such practitioner of the Vengeful Moon god.
I did many trips in the 1990s while being in the military.
When I went I always had to stay over a weekend so I would drive to one or two Belgian cities to take in the sights and be a tourist. I do not remember seeing any Muzzies except for a few when I was in Brussels.