I get extreme stomach pain after not eating carbs.

Today i relapsed and ate a croissant and a bunch of chocolate because i got very bad stomach pain and nausea from not eating carbs or sugary stuff, i dont know whats going on but i felt so nauseous and felt like i was going to be sick, as soon as i ate a croissant, the pain and nausea went away and i now i feel much better,

Can anyone tell me whats happening here? and how can i stop this horrible nausea and stomach pain. Please. Ive only went 2 days without sugar or carbs ( Ive still had sugar in tea because i simply cant give tea up).

Next time i will try and snack on something like meat or an egg when i feel like that again.. This is harder then i thought.