Barb
You are so NOT a failure. And you are not alone. I've been on Avx, Copax, Rebif, Methotrexate.
I'm taking Imuran with no side effects. I just started Namenda this week so after 3 days of titration, it's too soon to say.
It's not you. Keep your chin up. As my doc always tells me, there are so many new things in the pipeline, one is bound to be right for you.