Stuttering can be caused by trauma. It is possible that you had such a bender, you did something bad to your brain. If you were going to "get" a stutter from your genes/shit luck, it would have shown up already. Keep in mind, if you had such a bender that you may have altered the neurological pathways and mechanisms used to produced speech, get thee to a doctor **pronto**. You may have done **serious** damage, especially if it is getting worse.