Sounds like you are in a dangerous situation. He may not have hit you...yet..... But screaming 2 inches from your face and shouting obscenities is ABUSE. As you said that he has not been diagnosed so explaining away his abuse as "Tourette's" is just making excuses for unacceptable behavior. I'm not an expert but I've known people who had Tourette's and they have involuntary facial or body jerks and may mutter or shout obscenities, BUT they don't get in someone's face and target them. Again these are just my observations.

If he has not sought treatment things will only get worse. He explains away his abuse of you as "well I never hit you" and then laughing about it???? BIG RED FLAG.