Goosieloosie, I have just been writing about vaginal Utrogestan on another thread! It certainly seems to be the topic of the moment. As you will have gathered, it is better used vaginally because it has fewer side effects and works better because nearly all of it reaches the womb.
If you get really fed up with your current regime and decide to change to Utrogestan, as Hurdity says, it might be difficult to take it vaginally every day for various reasons. I tried taking it every day along with the Oestrogel (by way of a continuous combined method) but I still had periods so basically, it didn't work and the gynaecologist told me to ditch it and go back to taking it monthly. Periods are a pest and I don't like them but I think they are the lesser of two evils and when taking the Utrogestan monthly, at least you will get a controlled bleed unlike the erratic bleeding you have now.
It's an ongoing debate on here but Professor Studd prescribed 100mg Utrogestan for 7 days per month for me and this is the minimum. You might also want to consider switching to the oestrogen gel which is more flexible because you can adjust the dose to suit your needs.