I understand what your going through all to well. Going in for another bone scan and a allergy test. Maybe these tests were not done correctly or things have changed to reveal the problem. Pain is still there after the last surgery and instability is always there. I find myself worrying about when the knee will finally give out. I have had bad dreams about it. Sleeping at night is always a challenge. To much nerve pain. I wish you all the best, stay strong and keep in touch.