Maybe it could be the Prozac... I know prozac can often be strong enough to take away depression for long periods of time. Meaning it could be strong enough to make him not realize any lash outs or mood swings. I've had plenty of friends who started taking medicine and were effected the same way.
My guess is your husband stopped drinking, felt withdrawel and depression, so he felt he needed medicine and if he stops taking the medicine that will also cause withdrawel and possibly start up the drinking again (it's a complicated situation).
Now, i'm not a doctor, but honestly, i'd maybe concider telling him to take smaller portions of the prozac every day until finally he can deal without it.
it's alot more gradual and his mind can react to it much better.
to be honest with you I'm an 18 year old kid. so i could understand you thinking my help is useless. but i only suggest this based off personal experiences. I hope it was helpful. Oh and i have friends in indiana =) it's a nice state