Where are you exactly?
Taking any progesterone continuously can be the issue - many of us prefer to stick with a sequential HRT regime and put up with a monthly bleed to try to achieve fewer side effects overall.
If you can get Provera (medroxyprogesterone) - this is also one of the kinder types of progesterone and could be better??? You could use an oestrogen patch or Oestrogel daily and take the Provera separately for 10-12 days each month to reduce any side effects - you can take Provera daily but this could also give some problems. It is about finding the progesterone that gives the fewest side effects - most progesterones will give many of us problems.
Have you ruled out having a Mirena fitted?
Also, another thought, don't be put off by trying the drospirenone as, though it seems to be in a higher dose, that may just be the dose needed in that particular type of progesterone. With most HRT regimes it's about getting the right balance of hormones, to control meno symptoms and also protect the womb lining from building up. DG x