My sinuses swelled up so much the doctor prescribed oral steroids.  I just had had a root canal.  The dentist put straight bleach in my tooth to disinfect the canals before he capped them.  Also, I had swam in a highly chlorinated pool the weekend before.  Is it possible, Im allergic to bleach or chlorine thats why my sinuses became so inflamed?
Thanks for your query, I have gone through your query. The swelling over the sinus region can be because of the two reasons, it can be because of the endodontic flare up following root canal treatment, or it can be an allergic reaction to the sodium hypochlorite or HY Chat Doctor.  Nothing to be panic, You can take a course of antibiotics like amoxicillin 500 mg and metronidazole 400 mg TID for 5 days (if you are not allergic). Along with antibiotics, you can an analgesics like diclofenac 50 mg BID for 5 days. To be on the safer side, instead of steroid you can take an anti histamine like cetirizine twice a day for 2 days. If the swelling does not reduce in 2 days, consult your dentist immediately. I hope my answer will help you, take care.