Blood in semen. To cure this problem,.

I am 40 years and 3 months old male. I have addicted for masturbation for last four years and doing it regularly on daily basis. On june 27th, sperm comes with blood without pain. I have seen blood first three days. Then I gave rest for one week and did masturbation but this time semen looked brownish color. Then have five days rest . Now semen looked completely white for the two consecutive days. But I had little brownish semen when I did masturbation and had intercourse too for the next two days. But I am having mild pain at the lower abdomen (just above the bladder). This pain is lasting for me for the past 2.5 years occasionally that too i am getting it while standing long time mostly. No fever, no burning sensation while urinating. Kindly suggest some advice or medicine that how to cure this problem,. Thank you