Your husband's surgery has terrified you for deep reasons that only you can know, and maybe do not yet know. Your reaction of relief once you saw the reality of his recovery in the husband was because you were dealing with the realiy of the experience, not because of the prozac alone. Now you are regressions into the bad fantasy interpretation and you have dig yourself out of that and get back to reality of a husband who needs you, and a life you have to lead. The catastrophe scenario is over in reality now you have to get over it in your head.
glad to hear your husband's surgery was a success!