Starting stuttering out of the blue again

Starting stuttering out of the blue again Okay I'll give some information, I used to stutter sometimes as a kid but that went away. Anyway yesterday I woke up and was extremely sleep deprived so I took 200mg of modafinil and went to work. Came home and when trying to talk to girlfriend or whatever she is and her friend, I just couldn't get my words out.. I knew exactly what I wanted to say but I kept stuttering and it was getting incredibly frustrating, could this simply be due to being tired, the modafinil and coming home from work? I should also mention that I've started taking diazepam again but I took it before bed, so perhaps my mind is going faster than my mouth as I've removed the anxiety,, which would normally prevent me from talking anyway but yeah I just wanted to check that I'm not broken. Sorry for the grammar, I'm not very good at writing.