Sick again

My son was diagnosed with mononucleosis three weeks ago. His Dr. prescribed a lot of rest, but how can I 18 years old rest??? He missed school and when I got home he was changing some parts to his car. He is loves car and his hobby is fixing them. Of course his immune system suffered and today he got sick again. The Dr. said that he must rest. Hopefully this time he will. Tomorrow I will take him to his homeopathic Dr. he can find the real problem and bring him back to his normal balance. I am a fan of alternative medicine, for me and my kids has worked very well.