Is it normal to feel nausea, tired and dizzy almost a week after an operation to remove a lipoma (general anesthesia)?

I had a 11 cm lipoma removed from my back last week, under anesthetia. I stayed over night at the hospital. Post operation, they gave me a morphine based injection, which I had an allergic reaction to. I was discharged and have been home for 5 days now. The issue is that I feel very nauseas and out of it... Dizzy and as if I will faint. Is this normal?