I had my lumpectomy 3rd December. Returned to work 2bd January. Thought I’d be fine but like you my head is a mess. Should be positive but just feel there’s a cloud over my head that keeps whispering C word in my ear. I feel old, I feel fat, I feel sad, angry, unmotivated. The weather doesn’t help with constant cloud. I guess the answer is to acknowledge your thoughts are to be expected and to find something good in your day. I bought a bag of chocolate raisins today and some lacy pants!! Small moment of self care but I’ll take it. Would be good to know how you get on