The Church does have compassion for such souls. They teach the truth and they offer the Sacrament of Reconciliation.
However, your situation is different. You have a medical reason, very heavy bleeding, and your doctor(s) believe that hormonal therapy will help you. I hope that it is helping you. The Church has said that hormonal therapy is an acceptable use of such medical treatments and devices, even if it means that sterilization must be accepted as an unfortunate side effect. No one here is saying that you must remove your Mirena IUD, since you are using it for therapeutic purposes.
Furthermore, converts to the faith are expected to embrace and practice all the teachings of the Church. My husband and I were married nearly 15 years when I began to explore the faith. I immediately, like within a week of starting to read the catechism and commentaries on the teachings of the Church, approached him about learning about my fertility and I told him I was unwilling to contracept any longer. I also told him I was not willing to poison my body to destroy my fertility, nor was I willing to tolerate barrier devices. He understood and agreed, and even starting exploring the faith for himself. We were confirmed on the same day, the Easter vigil just a few months after we started going to Mass together. Now, please realize I had no medical reasons to use hormones for therapeutic purposes, so my situation was necessarily different from yours from the outset. But I just wanted to make the point that even if spouses began the marriage with a contraceptive intent, if/when one of the spouses converts or reverts, the new believer does not get a pass to break the natural or moral law on contraception. However, no person would be breaking the natural or moral law by using hormones as therapy, even if sterilization was a side effect.
Other posters have already addressed these points with you upthread, so it is unfair that you say that no one has addressed any of your concerns. Also, I was not directly addressing you with my earlier plea, unless you were one of the posters who was purposefully promoting things that are against Church teaching, or one of the posters who was saying that abstinence (periodic or total) within marriage is wrong. If you did neither of those things, then my earlier post was not addressing you at all. And I hope that I have answered all your concerns. If not, please read Humanae Vitae (available online for free on the Vatican website) and speak to your priest. It would take only about a half and hour and it addresses all of your concerns very eloquently and succinctly.