It sounds like Watson/Savvas have bowed to BMS pressure on progesterone doses so there is no point in going to them. If you are progesterone intolerant, you will never cope with that dose.
A Mirena coil is a definite maybe but again, if someone is diagnosed as progesterone intolerant, it's not going to fly. Although the progesterone from the coil is mostly confined to the womb, enough of it can reach your overall system and cause side effects like breast pain in my case.
A progesterone coil with a lower dose than the Mirena (Jaydess) is worth a try. It's not licensed for HRT use (only contraception) but there is no reason why you can't try it as long as you have regular scans. I found the Mirena caused too much thinning of the womb lining so if you can swing the Jaydess, it could be a good option.
Once you have tried all the conventional progesterone routes, the final port of call prior to the last resort (hysterectomy) is compounded progesterone. The Specialist Pharmacy in London who produce it can provide a list of all the practitioners who prescribe their products. I got on well with progesterone lozenges @50mg but they now have drops and creams that are also very good and very effective on the endometrium.
For the record, I'm not progesterone intolerant! I did think I had suddenly become so post menopause because the Mirena coil, Utrogestan and all other forms of synthetic progesterone triggered my silent migraines but it turned out that the dose was just too high and I how happily take 50mg progesterone every day with zero side effects.
