I had a bad stomach bug where i had constant vomiting and diarrhea for 10 hours and very violent vomiting projectile.developed chest and back pain during the end of it and have persisted for 2 days hurts to take a deep is this cause for concern?

You possibly could have little tears in your esophagus from the violent vomiting. You also could just have a nasty esophagitis from 10 hours of stomach acid irritating same esophagus. Less likely would actually be a small pneumothorax from the violent spasms- I've seen that once in a teenager and read about rare cases of this happening. If you have any respiratory symptoms. you may need xray...