That is a tough answer that you will have to come to terms of on your own. I can see how you could feel like you did not give your W a chance because she has has a mental disorder. However, you need to put your own (and your childs) happiness first.
I now believe that my W has some kind of mental problem too. I have insisted various times that she needs to see a counselor, but it was only in the last week that she indicated that she just may do that.
It all depends upon how dedicated your W is to fighting her problem with medication. Who is to say that she stops taking the meds some day to only return to the way she has been.
You know in your own mind that you will never sip the sauce again in your life, but can you say the same about your W dedicating herself to treatment for life?