Hello dear, Sinus infection following tooth extraction indicates communication between your oral cavity and maxillary sinus(oro-antral fistula).Usually,most of such fistula are small,and heals with supportive treatment with antibiotics,antihistaminics and good oral hygiene. But here,it persists even after three course of antibiotics.So there is chance of a persisting communication,which may need surgical closure.You please see your maxillo facial/ENT surgeon to see what is going on.Mean while,keep a fairly good oral hygiene.Eye twitching may not be related to sinus infection(unless it is very advanced to cause peri orbital inflammation). Wishing a faster recovery.Thank you.