There is a disease called psuedogout in which the crystals that form are from calcium. Even the most fit, healthiest of people get struck with these horribly painful and debilitating conditions.
I suggest that you see a rheumatologist so that you can have a deeper analysis of your condition to verify that you have been correctly diagnosed and, as such, receive the correct treatment.
Let us know what you find out and how you are doing.
Dear friend
i think you should test your RA factor and ASO titre ok
and now what is your drug now?
yours