Urinary problems first week of radiation

Hi,
Finished up my first week of radiation. All ready not peeing like I was before starting therapy. I’m on 4mg tablet of Flomax for BPH. I meet with doctors on Monday. I will consult them. What was the remedy to get you back on track to urinate. I didn’t think this would happen so quick. 4 more weeks of radiation to go. Ugh! Not a big fan of ibuprofen. Thx