Surgery for hydrocele?

My son had a hydrocele on his left testicle, and a little one on the top of his right one. However, the dr was only concerned w his left one, and they only worked on getting the fluid out of his left side. They did not do anything w his right side. So its still there. My son recently had a surgery on the 13th of Nov, but just today, i saw that his left side is having fluids again, whenever he cries or shouts. Sighh.... im so worried sick about him, did it came back? He just had surgery to remove it? I called dr and he isnt here, waiting for nurse to call me back.