I had varicocele surgery 9 days ago. I still have swelling on my scrotum but my urologist examined it yesterday and it's not hydrocele. How high/low my risk to get complications such as atrophy, hydrocele, and hematoma in terms of percentage?

Your Surgeon has Ans. Your surgeon has the answers to all your questions. Did you not ask him about these concerns/questions before surgery?.
I personally do not think you have any of the risks/complications if your surgery was done by a competent urologist.