I'm Male 20, I Have Stone In My Left Kidney,

I'm male 20, I have stone in my left kidney, of 7.3 mm. I am prescribed for nephrogard, potrate mb6, urimax 0.4mg and supradyn . I have to use superspas if in pain. I was having uti in morning so I was advised by the doctor to use urimax 0.4mg. It's the 5th day I'm using urimax 0.4mg. The problem is when I masturbate I can't ejacualate no sperm, while I get orgasm. I feel as if sperm is coming out while it don't. It's the third day since this problem. Please help soon I'm really tensed.