It is possible that you had a different virus the second time - and because your immune system was still a little bit 'down' from the previous stomach flu, you picked up a different virus. I would also have suggested that some tests be done, especially to check for parasites or bacteria (other than the normal bacteria) in the stool - if this was not done and if you are still symptomatic, then rather go back to the doctor. Good luck and I hope that you feel better soon.
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