Varicose veins in the testicle will make me infertile in how long?

Good afternoon, my name is Daniel, I'm 18 years old, I started to feel pain in my left testicle and abdomen. I went to a doctor who told me that it was varicose veins in the testicle and that he needed corrective surgery in the scrotal vein. But what scared me the most was that the doctor who informed me said that I could become infertile or stop producing sperm. I do not have a right testicle. I was born with a problem in it so I wanted to know if these varicose veins will make me infertile in how long? Since my removal surgery of the right testicle no longer works and the correction of the vein in the left testicle has not yet been marked because I am in the queue.