First, I'd be more concerned that my pain be treated adequately rather than which drugs may/will be used. Concerns should be addressed to the doctor who has been manging your pain (and prescribing meds) to communicate your history to the hospital & surgical staff/team.

Second, most (American) hospitals today have some kind of Patient Bill of Rights Try google - many are available online. Some of these documents include the right to have pain adequately addressed - others do not. The hospital where your surgery will take place should be able to provide you with a copy of any documents/policies pertaining to post-op pain management.

Third, most (American) hospitals today also have some kind of patient advocate whom you may also wish to contact in advance to discuss your concerns. This person may be able to expedite communication to the right people.

Best wishes on the surgery,

Doc