trionic - that's what happened to me! It got worse and worse from the age of 32 until three rounds of surgery earlier this year (I'm 37). During the last year, I didn't stop bleeding - and I mean every single day. The lack of sleep combined with the anemia resulting from bloodloss combined with my inability to leave the house or to get GPs to listen or take it seriously meant that I nearly lost my mind. (I am not exaggerating!)
I'm going to talk very pragmatically here- not about what I think is right, but about what I think might be most effective within our existing, sexist system, to access help for you. My experience is that there is a very slow, very cumbersome flowchart that you have to work through with menorrhagia, and that if you skip a step it can cause you problems. This should not be the case, but there you go.
I understand your concerns about the Mirena - I shared them and still have reservations. However, I found that it was a step that I was pretty much forced to go through in order to access further help (otherwise, they turned around and said 'Well, it can't be that bad, you haven't tried this'). It did absolutely nothing for me - BUT I am in the minority. Many women find it really helps them and does reduce their flow by a considerable amount. It sounds as though it might be worth a try in your case??
Do you know what is causing the bleeding? When you saw the consultant, did they do an ultrasound? In my case, it was a fibroid - not even a large one, but one in very much the wrong place. There are very new techniques that they can use to remove these without affecting fertility (it's called 'morcellation') and it is much easier to access this at your age. Of course, there are other removal technique too, but they worry about scarring - even where the woman is screaming at them, saying that she just wants the bleeding to stop, doesn't want children/more children etc.
/end of pragmatic bit
I agree with you that there is a double standard in relation to vasectomy. (I think this is deeply gendered). There seems to be a working assumption that women are irrational and liable to change their mind about having children. I understand that this is a concern, but I do not believe it should overrule our decision and that if a woman can show that she has seriously considered all the consequences and understands fully what she's letting herself in for, then it should be her final call.