Bleeding And Anemia Problem, Birth Control Pills Not Working Properly. Advised For Vaginal Partial Hysterectomy. Problem?

Good morning doctor. I have had bleeding and anemia problems for quite some time. It's become very severe this summer, as even the birth control pills stopped working correctly. I kept going through constant light bleeding every day, and every now and then very heavy. In July I went to see dr and that week I was bleeding very heavy. He suggested ablation emergency that week. The ablation didn't work because of enlarged uterus so he did another d and c to help me. August 5th I went back after my healing period. It was suggested to have vaginal partial hysterectomy, removing the uterus and tubes. I am worried that since my uterus is large is this problem? He said if he has to he will cut it up to get it out, but this has me in general concerned. I'm just scared and sad. As it turns out i don't have kids, but I've been trying. This bleeding has been so bad though and has been problematic for many years. I have reluctantly accepted not being able to have children, especially now that I'm going to be 40 this year. Sorry my question though, do I need to worry about a large uterus being taken out vaginally?