Hi Pruners, so sorry that you're going through this .
Can I ask how far along you were when you miscarried? I presume you had 'morning' sickness before the mc?
I had my 3rd mc at the beginning of last month. I had hyperemisis which continued until I had the D&C, which was almost a week after we found out the baby had died. I was really confused as to why I was still being sick and yet the baby wasn't alive, but my gynaecologist explained that it's the placenta that secretes the HCG, and until that has gone I would continue to feel sick.
The second I woke up from the D&C I was ravenous and all the sickness had gone.
You say you have a small amount of retained tissues left - maybe (and I am speculating here as I haven't really got a clue) those tissues are from the placenta, and that is why you are still feeling sick?
Obviously, if the sickness is a new thing then that wouldn't make sense at all...
Think is probably best to get medical advice if you are worried, but I really hope you feel better soon x