Been sick for a week now, prescribed medication didnt work?

First of all, you probably have a viral illness. The antibiotics are used to prevent your cold from progressing into a pneumonia, not to treat the virus. You treat the symptoms as they occur - cough medication, lots of water, tylenol or motrin regularly for the headache, head, chest and back pain, an over the counter decongestant or a neti pot for your sinuses, rest as much as possible and expect this to take 10-14 days for your body to heal itself.