I went today for my 3 month check-up as I have been doing for the last 20 years. I have been taking Xanax 1 mg. 3 times a day for over 12 years now and today she changed my medicine for my anxiety attacks to Diazepam, 5mg, 3 times a day,..." but I feel that it is not working at all. I am feeling stressed. Is it a time frame for this medicine to take affect or a lower dosage.???