because of strict hippa privacy rules a medical provider is prohibited by law from revealing any medical information to another person including a wife. just because your husband was prescribed antibiotics in no way implies that he is being treated for an std.
does your spouses doctor have to inform you that your spouse has an std other than hiv? . my spouse and i share the same primary care md he knows about my husbands affairs and he's prescribed antibiotics to him more than once.