Your husband needs to quit making medicine decisions all on his own. It doesn't seem like any of the outcomes have been good. If he doesn't think a medicine is working or he can't tolerate the side effects he needs to bring that information to a doctor. Psychiatrists (and I hope that's who he's going to) are extensively trained in dealing with these drugs; your husband is not.

To cyberwoman
While one's previous symptoms can return when they discontinue any drug, I would want proof that there's such a thing as "withdrawal psychosis" after taking an antipsychotic. Also I would want to know the scientific basis for assuming there's such a thing as antipsychotic dependence, if you're using "dependence" the way it's usually used. You can't be addicted to antipsychotics. I'm not saying you're wrong, just that what you're stating as fact is controversial and not proven to many scientists' satisfaction