fibroids only need to be treated if they are causing you symptoms like pain, heavy bleeding, pressure, or other similar problems. since yours are quite large, it is quite likely that they will need to be treated. because they are in your abdomen and pelvis, their growth may not be visible easily from the outside, but it is possible that at least some of your weight gain is a result of the fibroids. the treatment for fibroids depends in many factors, but it includes surgical removal, hysterectomy, arterial embolization, and some other techniques. since every case is different, you really need to talk to your doctor about what is right for you. please let me know if you have any more questions.