Sorry, been tied up for a few days and not much use in the posting world. Yes DMI stands for Daily Magic Item, basically tracking the number of uses left for daily magic items powers. So if I have two items with daily powers and I use one, then I can't use the other. Though I have to look because I think reaching milestones may affect it as well (maybe I am wrong).
Working on a post now for Theo.
bhu, thanks for letting us know. I will be thinking about you and keep hope for only the best outcomes for your surgery and a speedy recovery.