continous bleeding and clots from prostate

Hello.  I am worried about my father and would appreciate advice.  He has been having blood clots and blood in urine for 8 months, and UTI's off an on for about 6 mos before that.  He had a polyp removed from his bladder and was told at that time there were several clots around it.  That was 8 mos ago, and he's been having the problem ever since.  He has been in and out of the hospital, had CT's, cystoscope, and they ended up recessing his prostate about 3 weeks ago.  He has not gone into retention since then, but still keeps bleeding and passing clots.  His hemoglobin is down to 9.  PSA was checked 9 mos ago, which was less than 1 then.  He feels very fatigued and just doesn't feel well.  He is 66 years old.  They did say the prostate biopsy came back with PIN, but not to worry.  They are saying he just has a weak prostate that bleeds easy.  Please help!