Had strep august. painful red throat,headache,fever,congested. took amoxicillin 875mg once a day 7 days got sick again last week bad cough cant eat,fever,congested. on amox liquid 400mg 6ml 2x a day. throat at sides still red why? is it still strep?

I wonder if it was a documented Strept infection, however it looks like you did not have adequate dosing. It should have been twice daily; and the reoccurence may be because of inadequate treatment or it could be that the sore throat is due to a bacteria that is not sensitive to amoxicillin and a different antibiotic with adequate course of treatment may be beneficial. Sinusitis is possible.