A stroke is read as a sudden loss of control over words or movement — a shock that leaves you unable to respond as you normally would. Like other illness dreams, it is a symbol, not a warning.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.