I do agree with seeing a speech pathologist. However, you will probably want to know what is causing this to happen, especially as it seems to be episodic? A good guess is that it originates in the brain, somewhere -- whether vascular, neurological, seizure of some kind, or a number of other possibilities. I can't stress enough the amount of education a good Psychiatrist has, all geared toward solving these exact questions. They will have a large array of diagnostic tools and assessments at their easy disposal, also. Just a thought. :-)