Blood in urine

I had chemo radiation and brachytherapy about 7 years or so ago. Twice since then I have had cystic opuses and both showed radiation cystitis. Last year I had blood in urine and gp did a dip stick test and said it was infection, did not refer me. Now I have blood in urine again. Gp did dipstick test and test urine away, but appears no infection.

I’m obviously worried. Can radiation cystitis last this long, or once there is damage does it never go away?