Your feelings of "anxiety and acceleration" in the morning are symptoms of Xanax w/d. 4-6 hours after the last dose seems to be the norm for most people. You ask what are the first sensations of w/d. Keep in mind that we are all different, that we all experience drugs in different ways, but apparently for you, anxiety and acceleration are two of the first symptoms of w/d that you're going to be feeling.
This is why Xanax is usually prescribed for "AS NEEDED," rather than daily use. It is a great med for panic, but not daily and not long term.
Please do not try and taper off the Xanax yourself. Consult with the doctor who prescribed it for you and work out a slow taper plan.
Best of luck
Greenlydia