Could I have gotten a GI or lymphoma cancer from 3 abdominal, 1 head and 1 chest CT from '09 until '12?

Very unlikely. The radiation doses from those exams is quite low compared to the radiation we are all exposed to in our daily lives, from the sun, the air, our water and the earth. In addition, tumors that are typically attributed to radiation take many years to become apparent.
Not likely. Radiation exposure is certainly a risk for developing cancer. For that reason current ct protocols try to limit the radiation dose as much as possible, and physicians should be prudent in ordering scans. That said, the risk from an individual scan must be very low, and the benefit of the information gained is greater than the risks of the scan.