You are too weak to take medicine after the operation. I suggest food as a supplement. You can use longan and black dates to make soup, or you can use longan and black dates to make soup. Because longan is a tonic for deficiency of heart-qi, nourishing blood, calming nerves, improving intelligence and strengthening body. And black dates are nutritional warehouses for invigorating qi and nourishing blood. Therefore, their compatibility can play a role in invigorating qi and blood, calming the nerves, preserving health, improving intelligence and strengthening the body. I hope I can help you, and I hope you will take my advice.