I was diagnosed with leiomyosarcoma in 2011. Three years before that, I had surgery to remove fibroids. Turns out the fibroids were suspicious for cancer at that time, but my doctor didn't catch it. Then 3 years later, symptoms returned and fibroids returned. After a biopsy, I was at Stage 2A. My only treatment was surgery. I had a complete hysterectomy. It was determined that radiation or chemo wouldn't be helpful. So far, it has been 11 years and the cancer has not returned. There is hope out there. Leiomyosarcomas can be aggressive and can be fed by estrogen or progesterone. I have had both Covid vaccines and every booster available, but since I have no ovaries, I'm not producing hormones, so it's not a factor for me. Just remember, synthetic mRNA has been around since 1984. Researchers took what they learned from those early vaccine studies using mRNA to develop the Covid-19 vaccine, so it's not like this was a completely new thing. However, acute stress from having Covid can cause the adrenal glands to produce more hormones which can change your menstrual flow. And as you know, there are so many other factors that affect our hormones. Hard to narrow it down to one thing. Try not to focus on that element, and instead focus on staying positive.