Hi, My name is Alisa and my doctor recently diagnosed me as Perimenopausal. Can perimenopause cause rapid weight gain? For example, 20 pounds within a 6 month period. Also, she asked if I wanted an IUD. Does an IUD help only with birth control or help control the symptoms of perimenopause such as hot flashes and mood swings? Thank you in advance for your help and time. Sincerely, Alisa