It doesn't seem likely to me that any of those will worsen your stutter directly. However, maybe in your case, whatever those things do to you will in turn do something with your stutter too - on account of it affecting you as a whole, and therefore influencing how things go, when you stutter. Can you "recreate" to the point of avoiding the worsening by reversing/negating the points you mention? (Except for the very last one, I assume)