Strep Question

Patient: I have recently been diagnosed with strep throat 6 days ago and the doctors gave me a Z-Pack for 5 days of 500 mg the first day and then 250 the second and naproxen for muscle aches and fever. I have came off the Z-Pack yesterday but today i have now started running a temp of around 100 and starting to feel weak and also my lymph nodes on the right side of my neck are swollen very large and my neck hurt to move and to the touch.