Does a wife's supplication against her husband fall under the category of supplicating against oneself, and is it answered similarly, especially if the husband experienced a weakness that affected his private relationship with his wife, and he has since been treated and recovered?

A woman's prayer against herself is forbidden. However, her prayer against her oppressive husband is permissible to the extent of his oppression. Among the forms of oppression is a husband's denial of his wife's right to conjugal relations or her other rights, despite his ability to fulfill them.