Last week my son was diagnosed with strep throat. His doctor prescribed 500 mg amoxicillin twice a day. He got the prescription on Friday and was feeling better Saturday morning and is still taking his medicine. He played baseball over the weekend and did a few more activities, attended school Monday, then started having diarrhea Tues, Wed, and Thurs morning about 1 - 2 times each morning. He is sleeping a lot and his eyelids look pretty heavy even after sleeping. He looks tired and says he feels tired. My son will be 13 this summer. Is this much tiredness and sleeping normal?