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Your concurrent infections (strep and sinus) are cause a eustachion tube dysfunction. Your eustachion tube is plugged up from your sinuses
. This is not uncommon. This is causing a pressure gradient in the middle ear. Until the plug is dislodged it will continue to cause pain.
I suggest flushing
your sinuses with a netti pot (to rinse out the sinuses), drinking hot beverages, increasing the humidity, using a saline nasal drops/sprays. It may take a couple of days to relieve the pressure. Continue taking the antibiotic prescribed by your family doctor. If the ear pain
is really unbearable, you should go to your emergency room for treatment.
I hope that I have given you an adequate answer to your questions. If you are satisfied with my answer, please accept. If you have additional questions or need additional clarification of my response, please contact me.