Sorry to hear that you are going through this, from behind my computer screen it seems like your wife has severe emotional issues. From your initial post she had issues even before she was medicated, the medication being a result of her issues.
Now there seems to be further issues, and your children are in danger.
you don't need to talk to your bishop, you need to call CPS and remove your childeren from her until her issues are resolved. Your kids need to be your priority adn while you say she went to counseling and got medicated, it's not enough there were no consequenses for her actions and she will revert to the same behavior.
"pregency" is a cop out......yeah ill get heat for this comment but in this case it is a cop out as these issues were pre existing.
I find the fact that you want to have more children with her disturbing.