Have you spoken to the doctor about all the side effects/withdrawl that you are suffering from the decrease in medications? He may recommend that you decrease them at a slower rate. Giving your body a chance to adjust and realign to the lower doses. I am in the process of changing out my sons GSD meds. One he has to be tapered on to the other tapered off of they have it set up on a 12 week cycle for this to happen. All to prevent the seizures. She has told me several time she will adjust the dosage chart if he seems to have to many negative side effects. 12 weeks seems to be the norm though.
Just a thought that you may need to inform your doc ot the side effects and see if slowing down your decrease may be warrented for your own mental sake