It is difficult to call any ct scans unnecessary just because they came normal.
Even normal ct scan hold a lot of information as it rules out many POSSIBILITIES for which it is planned.
Whether it was unnecessary can only be said if it was not required in first place.
Don't worry. 2 ct scans is not that high dose to worry. It is little high.
Next Steps
now the problem for which ct was done may be discussed. many intestinal problems are not detectable in ct. many of them are detectable.
Health Tips
maintain hydration, have plant based diet. salads sprouts green vegetables fruits etc. plenty of fluids coconut water lemon juice electral ors etc.