Hi there ~
I understand your concerns. Swollen veins as well as severe pain
in your right wrist is worrying and I do not believe that it is related to your having broken your arm. I hope you visit with a surgeon to find out what the reason for your enlarged veins are. I hope you are not using any other IV medications that can cause your veins to enlarge.
I hope this helped and I wish you the very best. Take care!