Our expert says:
From what you are saying, you have had an extensive period of illness, finally followed with surgery. This has clearly taken its toll on your immune system. It will take time for your body to respond to the treatment. You need rest, and to take a lot of fluids, and you should see your surgeon to exclude the possibility of infection (green phlegm).
There are a variety of products on the market to boost immunity, so you should be taking one that has been scientifically tested. Ask your ENT or GP to recommend a product, and check with an expert at a health pharmacy for advice. The reality is that this will take time.
You should also avoid environmental factors such as smoking and air conditioners.
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