Burning While Urinating

Had 7 proton prostrate treatments and am going through quite a bit of pain burning when urinating. Tried AZO not much help. Will try tonight Flow Max. They thought I had a UTI infection not the case after the culture test came back. They suggested drink lots of water, well that’s great but it also creates huge burning while doing this process. What have you tried that helped to reduce the burning? Ideas appreciated.