Osteoarthritis - worst it's ever been



I’ve had osteoarthritis for at least 10 years. This past week has been the worst. I had been walking at a CentreParc, and now the whole area of my knee and the back of the knee, below and above the knee is very painful, my calf muscle feels very hard, it’s the worst it’s ever been. No pain killer is touching the pain. What can I do?