I Had Aortic Valve Replacement Surgery Dec 9 Had A

I had aortic valve replacement surgery dec 9 had a catheter inserted then removed 2 days later but was unable to urinate so catheter was re-inserted 10 hours later then removed 2 days later then I was able to urinate on my own for 36 hours then I began to have blockage and went to emergengy when my bladder felt like it was going to explode a catheter was inserted and I released 1700 ml of urine within 15 minutes and was told to have it removed 6 days later which I did but could only release 200 ml in a 10 hour span so had catheter reinserted and told to come back in 5 days to have it removed which was today.I have drank approx. 1500 ml of water today and only released 200 ml in 4 attempts in 5 hours.This summer I was diagnosed with BPH and have been on Dutasteride .5 mg and Flowmax .4mg and had no issues urinating before the surgery.I am 56 year old fit male.