I am sorry to hear that you are having this terrible cramping pain in your abdomen!
I have no experience regarding your situation, but I know that many women who had this type of breast reconstruction, develop similar problems and it's important that you consult an internist ( as your Surgeon recommended) or ask your Doctor for a referral to a Pain Management Clinic .These specialists are skilled in the use of not only medications for pain control but they also have access to a wide variety of other pain management techniques.
In the meantime please click on the link below that might be helpful to you. You'll find lots information from other women who have experienced discomfort and pain due to Tram Flap surgery.
All the best and I hope you’ll find relief soon.