It’s a debilitating lung disease. My brother has it. It has pretty much destroyed his life. He went from a robust, hard-working factory worker to a weak, easily fatigued near invalid. He has coughing fits that last minutes at a time, during which he is gasping for breath. It disrupts his sleep, adding to the fatigue, and during one episode of which he had two heart attacks.
Good Lord, sorry to hear that. I never took the vaccine but I never caught it either.