There are other symptoms that I would expect to arise in association with a Spleen problem. Chinese herbal therapies can help you. If you've been messing with too many antibiotics, you're killing off all the friendly flora in your gut. If the problem does indeed arise from your Spleen, then the antibiotics are aggravating the situation. The Spleen likes warm and dry.
Antibiotics are very cold in nature and so they can cause additional problems for the Spleen.
The other possibility is that the fever of the flu has dried up the liquids of the stomach. A key symptom of this so-called Stomach Yin deficiency would be a constant gnawing hunger that is not helped with eating food. Other symptoms would include sour stomach, gastritis, or heartburn. Problems in the Stomach can easily transfer into the Spleen and we're back to where we began. If there are no other digestive problems then we'd have to explore other possible explanations.