Ate a Burger that Left Out 24 hours

I ordered a burger on New years from the Cheesecake Factory. I only ate one bite because I wasn't really hungry. I just left the burger and fries sitting out lol.

I just reheated the burger & fries in a pan and ate most of it lol. I didn't eat anything today and felt hungry

Do you think it's OK to do this if it's reheated. I honestly do this so much. One time I got a very bad stomach ache after eating unrefrigerated food though.

I don't have a big appetite in general and I think I have a strong stomach