Have you and your husband considered adoption if you truly can not get pregnant?
I had endo and I was told that I could not have children due to scar tissue in my tubes. Needless to say I ended up with two who are now 19 & 20 and the doctors were surprised. Anyway, endo did calm down a bit up until about 4 maybe 5 years ago and it just became so unbearable that I had a procedure (ablation) which targets the uterus and should eventually elimiate your period. After mine I would spot for like 6 months at my scheduled time but that was it.
The downside to having an ablation is that you can not or should not get pregnant as it is dangerous.