You should be holding him as close as possible! if he wants to be cuddling with you, its the right thing! he needs to heat up his body with your body heat! don't leave him out of loving, his instinct is to go to mama for love and much needed heat for his illness, cats know what they need, let him, if he chills, he could spike a high fever and die! Cuddle him! I know you must want to and am not sure why you arent! We always cuddle our sick babies/cats. When they get too much heat, they will come out of the cuddle for air, then, when they are chilled again, pick at the covers to please be cuddled again under all the warmth!