For being able to get off without much withdrawl, if you step it down a tiny bit, Clonidine.
Catapress is the brand name of Clonidine.
These are my go to for managing flashbacks if my other coping tools that are not medication-based do not work. It seems to turn the PTSD into the "off" position within two doses. Quiets things down without feeling medicated.
I take a child size dose and it works. It helps you sleep, and you wake up feeling well rested, but a bit groggy.
It does treat/prevent night terrors and nightmares for most people. Although I suggest combining it with aromatherapy for best results in stopping those when chronic.
I 100% agree that EXTENDED release XANAX is the best stuff on earth in helping you feel better with PTSD, but it has some major drawbacks.
1. Addictive
2. Makes you more selfish and have impulse control. AKA turns a "giver" into a "taker"
3. Makes obsessive or dissociative symptoms a bit harder to manage/worse
If your main thing is anxiety, it is, I believe still the gold standard, albeit highly addictive and hard to get off of. I do agree, taking a lowest dose and only as needed could be the way to go. Same for Clonidine though. Less addictive and just as effective. So maybe discuss.
Also Clonidine is used to treat ADHD in children. It may help you focus on school work. Xanax may discourage you from doing schoolwork and make you more prone to procrastination.