I would have to agree with flob. Addictions can happen at any dose, and staying in close consultation with your doctor is a must.
thats a very low dose so as others have said, it's not likely. however, i've seen and experienced addiction at very low doses, so it can happen. the question is that is it really addiction or the beginning of addiction at that level? for me it would be addiction...for others it wouldn't. it's all individual which is why it's important to have a somewhat close doctor-patient relationship when taking those types of meds.
Seems unlikely since you are not overdosing and are not on a maintenance dose.
Anxiety can persist for a long time, even once the crisis has passed in my experience. Throughout all of this, have you been seeing a therapist to see why your stress has been going up. You can get addicted to benzos, but you were not taking that much, however, it is usually prescribed short term and is used on an as needed basis...have you talked to your doctor about it?