Hi OP, I can completely empathise with you about your horrible periods. I have endometriosis, but I've had relief from the pain, since my daughter was born. But the bleeding has gotten to the point that I'm severely anaemic and taking extra supplements. I've recently started to use red raspberry leaf tea and have found it to be very good. My last period was not disabling in the slightest (normally I'm frightened to go outdoors for a couple of days). Is it mainly pain that you're talking about or are they heavy or irregular? For irregular periods, I take agnus castus, which has regulated my cycle to 29-30 days, instead of 19-50 days. Pain has never been helped by anything other than ibuprofen.
I know you said you've tried everything, but have you been offered an endometrial ablation? I would have had this, were it not for the fact that I don't want my fertility gone. As you've said you want a hysterectomy and you don't want children, I would advise asking about this procedure, if you haven't already done so. A hysterectomy is a major operation and really will only be done if everything else has been exhausted or for conditions such as cancer.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley