Translation of repentino

At noon the oldest soon came home. He was a doctor and gave me some salt and other Cuban medicine. I was reluctant to swallow that stuff but the pain and the doctor's smile persuaded me in the end.
They are not used to live together with other religions and cultures and they do not know how to coexist. In each region people assume things about others, but in some regions the hatred grows.
My wife joined me two hours later and everybody went to breakfast. The plan for the day was to visit a cave on one of the islands. We took smaller boats to get there as the ship was too large to approach the island.