Lump seen on CT Scan...Now what?

I've had diahrea and bloating and abdominal pain for over 3 months now so I was sent for an abdominal and pelvic CT scan with contrast on Friday. I just got a call from my GI doctor that my stomach looked OK but that a "lump" was seen on my vaginal wall and that he wants to contact my gynecologist ASAP about this. It measures 1.6 cm and he doesn't feel this is causing my stomach problems at all. Should I be worried? I'm 35 years old. When I asked what to do about my stomach he said we need to deal with this first.