when i first found out i had a cyst on my ovary. i seen this gyn. doctor who just gave me ultrasounds for six visits and told me i m fine.
i complained to my primary care doctor, so he sent me to another gyn. doctor and that's when the doctor was so informative. he addressed me spotting for weeks, and getting on birth control. i went from spotting for weeks to bleeding very heavy with clots for weeks. so i had a hysteroscopy (camera in uterus+ d&c) d&c=scrape the lining of my uterus because it had thicken and caused heavy bleeding.
point
yes, you should get a second opinion. when your scared about something or concerned about it, your doctor should reassure you by explaining everything and tell you what he can do for you.