Prostate and constipation. 9. 7 x 4!

I am 80 years old and am having VHP. for which I am taking treatment for last 12 years. I am taking Fludart plus since last 1 year. I get up night 10.30pm - 5.00 am at least 3 times for urination. My PSA test results for last seven years, tested twice a yeas, have been less than 1 . latest being 0.07-0.6. Have never gone beyond 0.6 in last 7 years. 1. Does the PSA results rule any malignancy Since last 3-4 months I have been having constipation due to which I get motion only after the breakfast and not earlier. Is this related to prostate enlargement ,or due to piles. What are the side effects of Fludard plus In a Ultrasound test on 12/11/15 the prostate weight was 25gm, PVRU was 92cc Right kidney was reported normal in size and shape and was 8.5 x 3.8 cm. Pelvicalyceal system not dialated. No hydronephrosis or calculas sen. Left kidney normal in size shape position and outline and - measures 9.7 x 4