Undifferentiated Connective Tissue Disease means that it could be MANY different ones all wrapped up into one. It basically means that your mom fits into different autoimmune diseases.. like Lupus, Scleroderma, Raynauds, etc. Basically if a person was to draw up your mom's symptoms on a chart, and you made circles it would be like this. One heading would be SLE and then her symptoms. Overlapping that would be Scleroderma and then overlapping again would be the Rheumatoid factor. So basically what it means is that she has overlapping disease processes. This is a much better diagnosis than the prior ones, that other Rheumy didn't even know what he was talking about! I am not completely convinced that your mom has Fibro, just from what you have said but perhaps? I am unsure how he came to that conclusion!
The Osteo's can be from the Prednisone. It can cause bones to become brittle. Make sure your mom is taking a calcium magnesium supplement every day to ensure good bone structure.
I think why he is taking her off of the Gold injections is to "see what happens" with her blood work and body. That way, he can better assess her for the Rheumatoid Arthritis. Its all good girlfriend!!
I am so glad that this one is on the ball. Remember one time I think I mentioned an overlapping syndrome? Well that is what is going on with her. Basically he will watch her well and treat her and see how she does. It sounds like you are in capable hands!! Woohoo. Take care Deb!