My mom was recently diagnosed with stomach cancer. She never really had pains only problems with eating. Everytime she ate it would get "stuck" and after trying to eat she gave up when nothing would go down or stay done.
I would advise you to keep pushing the issue with your doctor. You know your body better then them and if you feel there may be something wrong chances are your right.
Even though your only 24 there are people on here that are in there 20s with stomach cancer and the best thing to do is to make sure you get it checked out.