I've had 3 ct scans with iodine contrast (my third one i had today) & multiple mri's with contrast. will this damage my kidneys?

Contrast OK but CT: exposure might be a little too much. Each time you get contrast, your kidneys will easily excrete it. As long as the doses are separated by a day or more, it won't hurt your kidneys. At only 19, you should talk to your doctor about ways to reduce the number of CTs to limit the ionizing radiation. MRIs and Ultrasounds have no ionizing radiation and are considered low risk for future cancer.