If you want to slowly and safely taper off the meds, be sure to tell this to all those you interview. As far as why the meds stopped working, I don't think there is one specific cause for that. Trauma is a complex phenomena that consists of many dynamics, and I wouldn't have high hopes that someone will give you a simple answer as to what causes the meds to stop working or to give you any satisfactory answer at all. From my experience, the best that the current medical system can offer you is to find the optimal meds that could more or less manage your symptoms without doing too much damage to your brain and other organs. It doesn't treat the root causes. The sooner you'll accept the limits of what you can get the better you'll be equipped to deal with the system. Self-education is key in your healing process. The more you educate yourself about trauma, the better you'll navigate your recovery. You have to take control of your healing into your own hands and to be able to critically evaluate what a health provider is doing instead of blindly trusting and relying on their expertise.