This is a common situation encountered by many patients. They visit a physicians office because of their desire to have a physician perform the treatment only to be told that the doctor does not perform the treatment in question.
I would recommend that for most varicose vein treatments, an experienced physician should perform the treatments. These are not benign treatments without risks, there are serious consequences to mistakes that can occur with injection. Only a very experienced nurse should ever be a substitute for sclerotherapy injections and it should only be happening on patients with small spider veins.