i had menorrhagia with moderate hypermenorrhea (more random, less heavy overall), which is now down to v. mild hypermenorrhea and i still have many of the worries you've described.

i hope you don't have to get a full hysterectomy, or even a partial one, but every woman's body is different and sometimes it is necessary to preserve overall health.

i completely empathise with the ranting against earth momma types fetishising menstruation (and refusing to admit that many 'natural' bodily functions go awry, of which menstruation is hardly unique).

i mentioned on another lady's lj shepherd's purse and yarrow root-- they are vasoconstrictors, and they work for some women with hypermenorrhea.

i hope you can find a permanent fix so you can get back to living life without so much suffering.