Why do I get frequent infections everywhere (throat, skin, intestine...) after curative cancer surgery without chemo? Can it be due to sudden drop of ldl? How do I restore my proper immune functions?

Not sure. I'm not sure why you get frequent infections but i can reassure you of one thing: it has nothing do with your ldl. Ldl has no effect on your immune status or tendency to infection. It does tend to drop in people who are malnourished and malnourished people are more prone to infection. Are you malnourished?