I would say that the different medications are incorrectly interacting with your brain causing some serious side effects. It sounds like you should try and limit the amount and variety of substances used. Try and narrow down the root cause that puts you in this "scrambled" state. It could be one of the drugs, it could be an interaction between two of them or you might need a complete overhaul of your medication regimen.

I understand that your pain takes priority, but you can't let it cloud your judgement. Pharmaceuticals are extremely potent and can be dangerous especially in combination. This mind state you describe can't be helping your brain to heal. Remember the injured brain is extremely sensitive to foreign substances. Please discuss this with your prescribing physician. Ideally the right painkilling substances will have minimal side effects and not increase your concussion symptoms. You don't want to add chemical insult to your existing brain injury.