Hi Suecee
Anxiety is a classic symptom of low oestrogen, but also some (synthetic) progestogens seem to cause this too. I would definitely start straight away on the half patch and see how you get on. As I think I said in an earlier thread sometimes some women do not get on with continuous progestogens especially the synthetic ones.
Unfortunately the utrogestan dose not come in any lower dose so 100 mg is what there is. If you used it vaginally you would be able to take it every other day, and might even get away with this orally on a low dose oestrogen - but orally there is quite a lot of variation between women in how much is absorbed and if it isn't absorbed well there can be problematic spotting. Of course used cyclically this wouldn't happen as the bleed would come monthly and predictably.
Let us know how you get on!
Hope this helps
Hurdity x