@sallylynn again your eGFR is not that bad yet so docs may not be recognizing that it has dropped. It is reasonable for you to wonder what is causing the drop and if it will continue. A nephrologist will make you feel better cared for.

CT scans and radiation won't hurt your kidneys but you can decline to have any contrast. Contrast is still okay for your eGFR technically but with what is going on I would probably deny it too.