Hi Crosscat.
Unfortunately the bloating and nausea together with headache, are side effects from the Femoston.
I'm actually on Femoston Conti, and I suffered the same at the start, but it does settle down once your body gets used to it, although it does take a while to settle. And I'm sure most HRTs do the same..but everyone is different, and will get different side effects. It is horrible having a swollen tummy.
I don't quite know about the actual sickness you've been having, although I felt sick, I didn't a actually throw up, are you eating correctly? Maybe if you've skipped meals this is why your throwing up ?
Maybe tell your doctor, and see what they say...but I'm certain, you'll not absorb much because of the sickness.
Wishing you well, let us know how you get on...xx