Hi, My mum has pain at the back of her knee, she is having lot of pin and it is extremely difficult for her to walk. pain, swelling alot. Nothing seems to work for her, neither the compression bands nor any analgesic, seems to be an issue of osteoarthritis and varicose veins. She is 61. No medicine seems to be working. She took Daflon 500 yesterday and today she fainted because of dizziness and with upset stomach. What should she take?