Have a flu it's 2nd day and i now have a bad middle chest pain/gets worse with movement/ feels like gas pain but isn't. what is this/normal for flu?

Flu & Chest Pain: Body aches are common with the flu. In young patients with no medical problems, chest pain that is worse with deep inspiration or movement can usually be treated with over the counter pain meds. If you have shortness of breath, cough up blood, or notice the pain is worse with exertion you see a doctor to get checked out.

Costochondritis: It sounds like you may have strained part of the rib cage and the small muscles that attach each rib to the other rib. A violent cough or coughing fit could have caused that. Hopefully you can see a doctor to verify this. If this is 'the flu' there are anti-viral medications that you can take. Tylenol would help with the pain. There is of course a flu vaccine that I highly recommend to avoid this.