You should certainly get referred to a GI specialist since you are concerned and with your family history- early detection they say gives the best opportunity for a cure.
I don't believe CT scan would be as good as an MRI for the pelvic soft tissue area. MRI is what pegged what was thought to be possibly a regular cyst by ultrasound as an endometrioma and how they spotted an abnormality between bladder and uterus (surgery proved it out to be folded bladder stuck to uterus).
Are you sure that what you are feeling beneath your belly button aren't your uterus and beneath that, your bladder since that's where they normally would be located?
If you are having symptoms in only one foot and not the other, I highly doubt you have Raynaud's.
Have you considered endometriosis as a possibility, since the pain used to center around your period? Those implants can go about anywhere and start growing, really messing things up. They can grow on and into bladders, grow into bowels, and go into a cul de sac that takes an expert gyn surgeon to properly excise the stuff out of (laser burning causes more potential for adhesions).
And what about a tumor/growth on the underside of your uterus toward your back bone- have they considered that?
Have they checked your sciatic nerve to see if it's being encroached upon?