Why does my stomach burn and hurt really bad after i eat?

Still be burning.: There are many things that can cause stomach burning. The most common are acid reflux and ulcers or gastritis. If this has been just short term, you could try using an over-the-counter anti-acid such a Zantac for a short course. If that does not work or if this has been a chronic issue, then you should see your doctor for evaluation. Good luck.