Withdrawal can make you feel irritable or even make you feel downright mean and ugly. I know when my DH was going through carb witdrawal right about the third day I had to remind him that our offspring weren't on the menu and offer to get him a tire to gnaw on it if would help him chill out.
Pair carb withdrawal with caffeine withdrawal or withdrawal from anything else and yes, you're bound to feel like biting someone's head off for a while.
If this is more than carb or caffeine withdrawal, then you don't have to go it alone...see your doctor or a counselor for help.