hello pennyj … I have been on dex for four months now. Started on 25mg twice a day with the instruction to increase as required. So I experimented with all sorts of combinations and dosages until I could find my sweet spot. And I have found it for now at 50mg early morning and again early afternoon.
Can I suggest you play around a bit and see what effects you get, though I acknowledge your shift work in that? In my experience, 25mg over a day does sound very low to have an effect, such as on anxiety. Also I found I had to drink a lot more water to keep the headaches at bay.
Apart from that, I can only describe my experience as fantastic. Life has never been better.