Fianna, when you tried the utrogestan increase to 200mg, did you take that orally? Did you try taking it vaginally or rectally? Usually this way your body absorbs it directly into the bloodstream and it isn't processed by the liver - which is what creates the metabolites that make some women sedated and have other side effects.
I now take 300mg at night and 200mg in the morning, sequentially, and have no drowsiness....
That would be my first suggestion. You use the same utrogestan capsules as orally, just insert them as far up the vagina as you can with a finger.
The other thing to say, is were you trying to take the utrogestan continuously (every day)? If so, I'd take it sequentially - for the second half of the month - as for peri-women. This way, you will have a break completely from it to allow the bleed. This 'schedules' the bleed so you get something like a period. If your body needs/wants to bleed and you are not allowing that through how you are taking the progesterone, it will just spot and bleed randomly all over the place. Which then freaks out doctors....
If you can schedule the bleed so it occurs at expected times, once you have stopped the utrogestan, then it won't worry doctors - and you'll know when to expect it. If you do this, you need to take at least 200mg from day 16-26 of your cycle (and none, the rest of the time). If you don't know when your cycle is, just take one of the bleeding episodes as day 1...