Hey
As someone already pointed out the symptoms you describe could be related to a neurological disorder but could also be caused by emotional stress or mental disorder.
When you are withdrawing from opioids/reducing the dosage many people are experiencing intense feeling of depression, anxiety and -also- anger(similar to what you described).
Many people think that an opioide like tapentadol, which is also a norepinephrine RI among other things, is even more capable of causing nasty side effects.
Try to reduce the tapentadol dose as much as you can, without introducing other or even more drugs, which probably won't help you, to your 'diet'.
If you still take the Alprazolam and zolpidem, fine. Do not reduce the dosage of these two, or in fact anything else beside the “Nucynta“.
You might even consider to increase the alpraz. dose(optimally only on the days you feel the worst), to help with the uncomfortable feelings of dread, anxiety and maybe also the anger.
- (Have an eye on the anger issue though, because benzodiazepines are able to disinhibit a person,similar to the way alcohol can make you loose your inhibition).
When your tapentadol dose is significantly lower, you should switch to an opioide like codeine or maybe buprenorphine. (Forget about the naloxone though. It's really nasty and Not good for opioide withdrawal because it is an antagonist.)
When during or after the switch you still feel really bad you might consider to introduce an (S)NRI like venlafaxine in adequate dose.
When switching to buprenorphine you have to be in moderate withdrawal from your opioide of choice(tapentadol in your case), to avoid the INTENSE
precipitated withdrawal buprenorphine is known for.
You have to give it a chance even when you don't feel that good at first. It takes some time for your body and mind to adjust to the partial agonist/antagonist which Bupe. is.
There are some more things to Take in the Equasion. I don't really have that much time right now.
Later this day I can give you a more detailed answer.
Good Luck!