Welcome! The first day of radiation is usually the hardest. Some use Ativan, but I have no experience with these, and did without, but some do need, and many only need for the first two weeks, after that, may need pain meds anyway. Try relaxing techniques, deep breathing, meditation, visualization, maybe see a therapist, and talk to doctor about the congestion, and his or her recommendation dealing with radiation, which may help matters. Usually the techs talk with you during the process. Hopefully, he has your company or from another going to his treatments daily. Good luck.