Hi, my mom had a cataract surgery on August 8. She is 83 yrs. old and after surgery the doctor prescribed her Vigamox 0.5% and Prednisolone AC 1% on drop four times a day. Today is day five after surgery and she still is having pain, stings, headache, dizziness and loosing balance when she walks. Is this normal or is she having any allergy reaction from the drops she is taking?