Really sorry to hear you are going through this.
The same thing happened to me (mmc at 12 weeks) and I had 5 episodes of heavy bleeding over a period of about 4-5 weeks, all of which resulted in a trip to A&E. Each time, they were deemed to be complete. Looking back, It was an appaling way to be treated, but I think they were short-staffed and I only ever saw junior doctorsw who mostly seemed too embarrassed to look me in the eye
My hcg levels also remained high, as it is possible that some tissue which does not come away can cause you to continue to make the pregnancy hormone Miserable, isn't it.
I would asked to be scanned to make sure your miscarriage is complete, as my final trip to hospital resulted in an emergency ERPC and several blood transfusions as the blood loss was so great after five weeks.
This also happened to me over the christmas period, so I know how horrible it is, and hope you are being kind to yourself.
It's horrible for it to go on for such a long time, and I really feel for you.
I know it really probably isn't a great deal of comfort to you right now, but all this happened to me, and two months later I was pregnant with my DD and am currently pregnant with DC2, so far with absolutely no problems.
Hope you are better soon.x