The thing is you are fluent person. You can’t loose fluency. The problem is that you don’t believe it. This is not a problem you have, this is a problem you think you have. Therefore, you are trying to control your speech with your conscious mind. Speaking is complex yet simple. It is meant to be controlled by subconscious mind because of its complexity. Why? Because conscious mind is able to focus only on 1 or 2 things at time. When you try to control complex speaking mechanism it causes panic and your limited conscious mind is simply not able to perform speaking. Because it never were meant to. I have found many people who regained trust in their speaking ability, stopped controlling speaking and forgot about stuttering. You are responsible for your stuttering. It’s you who create it every time. Thank you good luck.