I dreamed that I would get sick.

Don't care too much about your dreams. Maybe your subconscious is afraid to have another operation, because dreams come from the subconscious. If you are interested, you can go and see Freud's dream interpretation. Your mind may be traumatized by two operations. If your life is often affected by anxiety, fear and worry, then I think you should seek the help of a psychologist. I suggest you face life optimistically and positively, don't worry too much, just make yourself happy.