When you eat meat, your body uses acid to break it down.
When you eat fruits or vegetables, your body uses alkaline to break it down.
If you eat these two kinds of food together, the acid and the alkaline 'cancel each other out'... and you won't be able to digest the food properly.
This is causing your stomach pain.
Overeating is also causing you problems.
Don't eat ANYTHING with an ingredients label on it.... the food industry has conditioned you to think that food=love. Sugar is a highly addictive POISON that they put in everything. Eat only when you're legitimately hungry... eat only until you're not hungry... and treat your body well: stop treating yourself like a human dumpster. Eat only the good foods that God gave us to eat... nothing with chemicals... nothing with sugar. Put honey in your coffee... and only drink deliscious oxygen-packed water when you're thirsty. Lack of food didn't cause your bordom or stress... food cannot cure it. If anything, overeating is partly causing your stress.
Then you will have the body you want and the energy you need to enjoy life. These truths were taught to me by The Truth, incarnate - who is Jesus. Lean on Him always, for understanding. He wants you as His friend.