DazedandConfused,

You are asking about two possibly three very different things.

Word finding is common with PCS. It often gets worse with stress. It is more tied to verbal memory/processing.

Stuttering is usually a different dysfunctional process in the brain. Stammering is not the same from a technical perspective although some try to use the terms interchangeably.

As packers says, slow down, and think about what you want to say before you speak. I find that when I have word finding problems, if I look around the room at different objects, I can break through the impasse. Trying to force the word out with the sentence tends to just jamb me up harder.

As mentioned, a speech therapist may shed some light on your stuttering or stammering. It will help to understand the difference between a stutter and a nervous stammer when you are trying to find words. It may help you be less anxious.

Please do not get caught up with the idea that your little bumps are concussions. You have to impact enough to manifest symptoms at the time of the impact for it to be a concussion. The bumps are just annoyances.