It sounds like you are pursuing the right course of action. In the meantime he should aim to remain mobile and active. Swimming is a good activity. He could also start on an anti-inflammatory medication such as ibuprofen
regularly if he has no other contraindications to this. He should have X-rays of his involved joints if he has not done so already and occasionally an MRI
scan with gadolinium can be of benefit. In cases when the diagnosis is not clear occasionally we will biopsy
the joint lining of one of the involved joint.