my wife is experiencing blurred vision after having her molar tooth extraction. She was a stroke victim(and still is) but of course she got the green light from her doctor before  proceeding with the extraction. She feels the dental doctor who did the extracting recommended a less stronger antibiotic(than what she was previously taking) which she feels is the reason for her problem.previous to that she says she was taking antibiotics to have her sinusitis healed. What should she do?  Will be glad of your medical insights.