Hi Annabelle, welcome. Sorry you had to join us here. I understand how you are feeling. I finished a year of treatment last November and I still get worried about anything different like aches and pains and I rash I developed. I had 9 CTs during treatment as well a MRI and a PET scan. The CTs were for suspected blood clots on the lung because I had shortness of breath from docetaxal and inflammation of the oesophagus from radiation. My MRI was ordered because I had severe fatigue and fell asleep while driving one day. The PET scan showed inflammation that ended up being arthritis. I also had severe bone pain but that was from taking Neulasta (could it be that?). It is so hard not to worry especially when you have new symptoms. But your doctor will know about the likelihood of whether it could be something related to your particular cancer and order or not order tests accordingly. It is only with hindsight that I now think I was over tested - especially the CTs - but the doctors will order tests to rule out things and so many of us are thankful that they do. I definitely wouldn't think that I had been over tested if they had found a new cancer. As @primek said the fear is the hardest part. If you need to have another CT to reassure you then don't beat yourself up about it. Do whatever you have to to get through this thing.
Good luck.