You can sue but the lawsuit would be unsuccessful. Very unsuccessful. A plaintiff must prove that a defendant doctor violated a standard of care and that this violation directly caused the patient a significant injury or death. First, I don't think you've yet suffered any injury. Second, there is no way a jury would blame a physician when his office was raided by law enforcement. Third, the standard of care absolutely requires a physician prescribing pain meds to examine the patient on regular basis.
I recommend you simply find a new doctor. Why would you want to continue to see a doctor that is being raided by the DEA?