What Causes Sinus Pressure And Green Mucus Discharge From Nostril Post Cataract Surgery?

I had cataract surgery 3 months ago and had a complication. The machine which breaks up the cataract and suctions out the debris wasn t working properly so my canals got clogged and my eye pressure went up . I had IV that night at the hospital to bring down the pressure and the specialist re-opened the wound in my eye the next morning to relieve more pressure. He said everything would clear up in time, but since then I have felt pressure in my left sinus area, small amount of green mucus and blood from just the left nostril. Can these symptoms be caused by the complication? Then last week, I felt horrible pain in my upper molar which, after 6 days, sent me to the dentist. I explained my recent history and she diagnosed a dental abscess and prescribed 7 days of antibiotic and is recommending a root canal or extraction of my tooth. After 7 days of antibiotic, I feel terrific ... no tooth pain and no sinus symptoms. Is it safe to wait for a few weeks to see if any of my symptoms return, instead of having an expensive root canal and/or trauma of an extraction?