I am a 26 year old healthy female. since dec.2015 i have had upper stomach pain in back also. acid, gas, sharp pain, nausea. now vomiting pink. help?

Do not delay: Your symptoms are worrisome if worsened over last few months. Among many possibilities peptic ulcer disease/ gallbladder disease are of concern. Pain pattern with regard to food ingestion would be critical. Would suggest seeking medical attention, ideally with your PCP. Mean time a trial of a proton pump inhibitor, such as Omeprazole/ Pantoprazole/ Lansoprazole may help with your symptoms.