Ear pain, sore throat and headache are common in sinus infection. Along with antibiotics drink plenty of fluids to thin the mucus. Mucous thinning drugs and oral decongestants may also be used, as well as systemic steroids, topical nasal steroids and nasal saline irrigation. Steam inhalation should be continued. It is best to see your doctor and seek opinion for your symptoms. If the ear pain is severe you may need referral to an ear, nose, and throat specialist. I hope it helps.
Best wishes and kind regards!