Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. * The nausea after the surgery may be from - Gastritis via certain food elements - Side effect of antibiotics, pain killer medicines, calcium tablets or others given for surgery recovery * The insomnia is partial due to possible pain at operation site or stress, anxiety. Hope that this information will satisfy your query Feel free to ask for further doubts. Take care.