I think feeling doomed would be a bit of an overreaction. You cannot change the past and have to take everything into context. If your doctors felt the tests were necessary and the benefits outweighed the risks, then you should have no regrets getting the CTs, as they ruled out potentially acute and serious pathologies in a prompt and timely fashion. If this was just a one-time health scare, then I would not worry too much about it. However, if you have a chronic condition that requires getting repeated periodic imaging for the rest of your life, consider inquiring if there are other alternative modalities without radiation such as MRI that can answer the clinical question just as well as CT. For example, patients with chronic inflammatory bowel disease such as Crohn's can get MRI instead of CT enterography to assess for flares. There are pros and cons to every imaging modality. Sometimes CT is still better for certain indications, but it does not hurt to ask!