Hi Tim,
I think it is pretty normal to feel chilled due to sudden weight loss and the weakening of the body immune system. When you gain weight and get enough nutrition, the body temperature will rise gradually. Even now, 5 years post treatment, I need to wear thicker clothes than others at most times. As for yellow patches on the tongue, I can't say much and I had white painful spots everywhere inside my mouth which only went away after 3 to 4 months post treatment. Be patient, things do get better day by day, without your really realising.

Karen