Ultrasounds are a great way to start the diagnosis process.... usually the technicians have a pretty good idea of what they see. If there is fluid or swelling around your epidimus, then it's probably a case of epidimitys which is an infection that can usually be treated with antibiotics. Since you've already taken those, you should feel some relief by now. Otherwise, a hydrocele might be the cause - it is fluid in the testicular sac. Not sure what the treatement options are but I know it is fairly simple to treat/drain. On the other hand, cancer in the testicle is usually a hard mass and the ultrasound will usually show it. Anyway, can't go just by what a technician says, so when your Doctor returns he will be able to give you a clearer diagnosis and treatment options. Hope everything turns out OK!