I guess withdrawl from that small amount and small amount of time can happen. If you feel this is withdrawl then I suggest not doing it cold turkey. Break the .5 pills in half and take that for about a week and then only take the 1/2 a pill every other night.
I'd say to call your Dr's first......I'm not sure if that is withdrawl, thats how I am off xanax, that is all anxiety symptoms to me. When I took it 7yrs ago I was on it for 3 months and I weaned myself off and never had a withdraw symptom ever