Thanks for providing more information.
A change in stool color to a lighter brown/yellow could be an indication of increased transit time through the intestines.
The usual dark brown color is due to digestion of the bile salts from the liver.
When the transit time is increased, the bile salts are not as exposed to the digestive process and can be light brown, yellow.
Even as you have white stool which is not normal at all. Most of the time indicative of lack of bile due to biliary obstruction, liver disease, parasitic infection,IBS.
So further liver function test, CBC, ESR and stool routine examination should be done.
Chances of cancer are very less in your case so you shouldn't worry about it.
However changes in color of stools should be evaluated.
So consult your doctor for a clinical examination for further evaluation and management.
In the meantime take Metamucil and OTC Simethicone.
Hydrate yourself with oral rehydration solution.
Eat Brat diet.
I hope this helps.
If you have any further query then feel free to ask.
Positive feedback and bonus are highly appreciated.