I had swine flu 3 weeks ago and still feel very weak. I am taking an iron tonic, any 1else had same?

I myself have not had the flu but it's not unheard of to be recovering over a long period of time. I remember having an intestinal flu when I was a kid and it took me two weeks to recover and it wasn't nearly as strong as the swine flu. Just switch to healthier foods with more vitamins and if it continues for another week or so contact a certified physician